I have POTS what Sandy's daughter also have. I was told by my Neurologist that it was probably caused by the RSD as it's worse when I am in more pain. I can faint about 20-25 times daily when things are really bad. The other day I was Christmas shopping with my boyfriend and I had a really bad spike in pain and the next thing I knew was waking up on the floor confused and surrounded by people. Really hurt myself then and have been in more pain than usual.
I'm having a 24 hour blood pressure monitor fitted a week on Thursday to see just how bad my BP is. My Neuro's told me that I need to see a Cardiologist but I am unable to see them until I am 16 (February) ... so frustrating!
My Doctor wouldn't put me on any BP meds as my blood pressure isn't low all the times ... it just goes low at times. Was told they wouldn't work well because of that and would lower my BP too much.
I hope things improve for you. If you want to talk i'm here!