to save myself a lot of typing I'll give you the links to the RSD forum-
But extreme burning, swelling, color & temp changes are a major sign of it.
main RSD forum
http://neurotalk.psychcentral.com/forumdisplay.php?f=21
useful RSD links-
http://neurotalk.psychcentral.com/showthread.php?t=247
plenty of websites and info posts there