RSD pain is the worst known to mankind, and usually follows a severe trauma. I have RSD in the right leg, hip, shoulder, and back. There isnt much you can do for it, and most meds dont really work.
There is a few places you can go for information.
http://www.freepowerboards.com/crps/
Look in the links section in this forum for lots of great websites with information on RSD.
http://neurotalk.psychcentral.com/forumdisplay.php?f=21
The people at this website are very kind, and knowledgable about all aspects of RSD.
It is a terrible disease I wouldnt even wish on my worst enemies, good luck, and I hope your son finds some kind of relief.
Allen
Get him to a pain management center for a consult. They have many different shot recipes for chronic pain.