Temperature regulation issues can be a factor with RSD. Try taking a bath with Epsom salts. I find that I can "reset" my system this way most of the time.

Has your doc referred you to a pain management specialist yet? A sympathetic block can be used for diagnostic purposes, and the earlier it's done, the more helpful it can potentially be.

Head over to the RSD forum, and go through the stickies.

If you haven't discovered Dr. Hooshmand's site, some of it is a little outdated, but it's chock full of great info!!!