Hi overthehill,
Glad you've come to the boards..
It is hard going to so many doctors and sometimes even getting contradictory information..I know it seems as though our lives are comprised of one appointment after another...
this is a great place to come and to be able to ask questions and get sincere information that is based on real experience, not text book theory!
The sympathetic nervous system is what controls our 'fight or flight' responses and where the pain messages travel. The parasympathetic nervous system is where the calming signals originate. The ideal is to have the two in balance in normal circumstances. I have RSD in my left foot and leg which is spreading to my right limb...I also have burning in my face and in my mouth..my sympathetic nervous system is chattering waaay too much..

I hope the psycho therapy is helping!
Hope4thebest