Thank you all for your input. On one hand I hope it is RSD because then I would know why I hurt so bad. But then I read that it can be very dibilitating for some (wheelchair!!). I just kept thinking it was all related to my back, and it is, just indirectly now. If this shot helps will that be the diagnosis? When I see the PM will he decide from my symptoms before we schedule the injection? This is the PM doc who did my ESI's when he and the ortho surgeon felt it was still related to the disc. Now after the MRI the ortho recommended the sym nerve block. I haven't actually talked to the PM doc again, I see him on Tuesday. What are some questions I should ask him? I see that the Neurontin has helped some of you. Side effects? What should I expect after the injection? Down time? Pain? sorry so many questions. I'm really struggling here!