A quick look, found this MD giving advice on jammed finger playing basketball. Good luck!
http://menshealth.digitaltoday.in/menshealth/story.jsp?contentid=130&sid=5&cid=21

I don't know if this is from an MD or not but it at least is a Men's Health site:
(did I mention seeing a doctor?)
Men's Health Sports Injury Center
Treatments
"
Ice the finger immediately by holding it in a glass of ice water for 20-minute intervals. Taking anti-inflammatory pills and taping the injured finger to another one also decreases swelling.

Chalisa Fonza, the women’s basketball athletic trainer at Ohio State University, suggests a milking massage. Put the thumb and index finger of your non-injured hand together, and move them back and forth in a pinching motion on the side of the jammed finger.

If swelling continues after 48 to 72 hours, apply heat in 15- to 20-minute intervals to loosen the joint. For deep-penetrating heat that provides heightened joint flexibility, dip your hand in paraffin wax before applying heat.

Fonza’s players also use a device called the Power Web, which resembles a tennis racket made of rubbery material. For a homemade version of the Power Web, wrap one end of a rubber band around the injured finger and hold the other end tight with your free hand. Lift and bend your finger against the resistance of the rubber band, and do two or three sets of 10 repetitions for each motion, three or four times a week."
http://www.menshealth.com/sportsinjuries/jammed_finger.html
This short pdf from an MD is not about pain, but explains maybe why it would be important to have a doctor assess it due to potential long term injury
http://www.roanokeortho.com/sports%20journal/Article--Jammed%20Finger(02-15-01).pdf

A detailed article, sorry, I don't know what the qualifications are of this person if any. Will keep looking, and if I find something that looks really like a qualified person about your jam, I will post it with stars around it, ok? http://www.sportsinjurybulletin.com/archive/finger-injuries.html
The Use of Cold and Heat after Injury: Evidence and Myth (2 PhD researchers) PDF acsm.org (American College of Sports Medicine)
"Cooling modalities such as ice are advocated
instead of heat for the initial treatment of
acute injuries such as sprains, strains, fractures,
and other inflammatory conditions"

"pain reduction occurs after the tissues are cooled to 10°C
to 15°C [~45°F - 50°F]; however, the duration
of pain relief is uncertain.1
Although some individuals may express
relief with the use of heating within the first
72 hours after injury, the use of heating
modalities such as hot packs or ultrasound is
generally contraindicated for the first 48-72
hours after an acute injury because it tends to
increase pain and swelling."

*******Lots and lots of detail with explanations of how cold/heat works*********
http://www.acsm.org/AM/Template.cfm?Section=Search&section=20043&template=/CM/ContentDisplay.cfm&ContentFileID=692

Cold is probably the best, you want to reduce swelling. Aside from that, splint it so you reduce the chance of any mobility to your finger. You just need to give it a rest, time is the only thing that can heal this one.