Glad to see you are doing research before jumping into...or being pushed into a treatment you are not sure of. My RSD is left hand/wrist and now arm. The rest of the arm was not involved before but after the stellate ganglion block guess what??? spread and now whole arm and shoulder. I put the block off since mid July....and finally desperate and went for it and I am sorry I did. I had no relief from the pain, it intensified and caused a major flare up. Just thought I would give you another side of the block.
Good Luck...and continue to do research and ask questions