According to the Mayo Clinic (see http://www.mayoclinic.com/health/drug-information/DR602801/DSECTION=side-effects ) there is a laundry-list of side effects. Among those, the following seem to be related to your complaints: "Abdominal or stomach cramps", "Nausea or vomiting", "Acid or sour stomach", "Burning feeling in the chest or stomach", "Difficulty having a bowel movement (stool)", "Excess air or gas in the stomach or intestines", "Heartburn", "Indigestion", "Stomach discomfort, upset, or pain".

Note that heartburn is certainly listed as a rare side effect.

The full list is:

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Rare

* Abdominal or stomach cramps
* Abdominal tenderness
* Black, tarry stools
* Bleeding gums
* Blisters
* Bloating or swelling of the face, arms, hands, lower legs, or feet
* Blood in the urine or stools
* Blurred vision
* Bone pain
* Burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings
* Chest pain
* Chills
* Clay-colored stools
* Cough
* Crying
* Dark urine
* Diarrhea, watery and severe, which may also be bloody
* Difficult or labored breathing
* Difficulty in moving
* Difficulty with swallowing
* Discouragement
* Dizziness, faintness, or lightheadedness when getting up from a lying or sitting position suddenly
* Dry mouth
* Excessive muscle tone
* Fainting
* Fast, irregular, pounding, or racing heartbeat or pulse
* Feeling of unreality
* Feeling of warmth or heat
* Feeling sad or empty
* Fever
* Flushed, dry skin
* Flushing or redness of the skin, especially on the face and neck
* Fruit-like breath odor
* Headache
* Hyperventilation
* Increased hunger
* Increased sensitivity of the skin to sunlight
* Increased thirst
* Increased urination
* Irregular heartbeat recurrent
* Irritability
* Itching
* Joint pain, stiffness, or swelling
* Lack of coordination
* Loss of appetite
* Loss of interest or pleasure
* Lower back, side, or stomach pain
* Mood or mental changes
* Muscle aching or cramping
* Muscle pains or stiffness
* Muscle tension or tightness
* Nausea or vomiting
* Nervousness
* Noisy breathing
* Pain
* Pain in the pelvis
* Pain, warmth, or burning in the fingers, toes, and legs
* Painful or difficult urination
* Painful, swollen joints
* Pale skin
* Palpitations
* Pinpoint red spots on the skin
* Pounding in the ears
* Problems with speech or speaking
* Problems with vision or hearing
* Quick to react or overreact emotionally
* Rapid weight gain
* Rapidly changing moods
* Redness or other discoloration of the skin
* Restlessness
* Seeing, hearing, or feeling things that are not there
* Seizures
* Sensation of the skin burning
* Sense of detachment from self or body
* Severe sunburn
* Shakiness in the legs, arms, hands, or feet
* Shortness of breath
* Skin rash
* Sore throat
* Sores, ulcers, or white spots on the lips or in the mouth
* Sweating
* Swelling of the feet or lower legs
* Swelling or puffiness of the face
* Swollen glands
* Tightness in the chest
* Tingling of the hands or feet
* Tiredness
* Trouble concentrating
* Trouble sleeping
* Troubled breathing with exertion
* Unexplained weight loss
* Unpleasant breath odor
* Unusual bleeding or bruising
* Unusual tiredness or weakness
* Unusual weight gain or loss
* Vomiting of blood
* Wheezing
* Yellow eyes or skin

Incidence not known

* Blistering, peeling, or loosening of the skin
* General feeling of tiredness or weakness
* Hives
* Hoarseness
* Irregular or slow heart rate
* Large, hive-like swelling on the face, eyelids, lips, tongue, throat, hands, legs, feet, or sex organs
* Light-colored stools
* No blood pressure or pulse
* Puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
* Red, irritated eyes
* Red skin lesions, often with a purple center
* Stomach pain, continuing
* Stopping of heart
* Unconsciousness
* Unusual behavior, such as disorientation to time or place, failure to recognize people, hyperactivity, or restlessness

Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
Rare

* Acid or sour stomach
* Belching
* Burning feeling in the chest or stomach
* Change in sense of smell
* Change in taste bad unusual or unpleasant (after) taste
* Changes in vision
* Continuing ringing or buzzing or other unexplained noise in ears
* Difficulty having a bowel movement (stool)
* Excess air or gas in the stomach or intestines
* Fear or nervousness
* Feeling of constant movement of self or surroundings
* Full feeling
* General feeling of discomfort or illness
* Hearing loss
* Heartburn
* Impaired vision
* Indigestion
* Itching of the vagina or genital area
* Lack or loss of strength
* Loss of memory
* Pain during sexual intercourse
* Passing of gas
* Problems with memory
* Redness, swelling, or soreness of the tongue
* Sensation of spinning
* Sleepiness or unusual drowsiness
* Sleeplessness
* Sore mouth or tongue
* Stomach discomfort, upset, or pain
* Swelling or inflammation of the mouth
* Thick, white vaginal discharge with no odor or with a mild odor
* Unable to sleep
* Vaginal yeast infection
* White patches in the mouth and/or on the tongue
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In addition, you should also consider possible drug interactions. For example, according to http://www.mayoclinic.com/health/drug-information/DR602775 if you take Xenazine there may be serious side effects if you also take other drugs including Avelox:

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Make sure your doctor knows if you are using chlorpromazine (Thorazine®), thioridazine (Mellaril®), ziprasidone (Geodon®), moxifloxacin (Avelox®), quinidine, procainamide (Pronestyl®), amiodarone (Cordarone®), or sotalol (Betapase®). Using any of these medicines together with tetrabenazine may cause serious side effects.
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Avelox is an antibiotic with so many side effects that are usually mild when it is taken correctly.

http://www.medisave.ca/DrugMoreInfo2511.aspx

Just a little more on this subject.

Avelox is an antibiotic with so many side effects, as can be seen from the answer voted as Best.

Yes all antibiotic absorption is affected by such products as antacids due to the calcium content of them mostly.

You should also know that this drug has interactions with vitamins and mineral supplements, antacids, and other calcium and magnesium preparations, as well.

It is not that you can’t take them, but you should not take an antacid within three hours of taking the antibiotic, so the antibiotic can be absorbed into your system.

What they don’t tell you in addition is the following:

Specific to the side effect of diarrhea is that more than just diarrhea, this drug (and many drugs like it) also have the effect of killing off the natural flora of your digestive system, which also might induce an overgrowth of the bacterium Clostridium difficile, which causes a disease known as pseudomembranous colitis. There is some evidence that taking brewer’s yeast can help in this situation.

In any case it is advisable to take Probiotic supplements, such as can be found in probiotic milk products, yogurt, etc. Look for products with one of the probiotic saccharomyces organisms in it. This will help to replace the natural flora of your digestive system. Remember you can’t take these within three hours of taking the antibiotic as they will block absorption of the antibiotic.

There is a natural product called Septilin that you may want to consider looking into for future consideration.

Note/warning: The comments and suggestions presented are not in any way intended to replace the advice and directions of a medical doctor or other health professional.

well you really can get sick!