Hello. I can't speak to all of your questions. However, my RSD started in my wrist and spread to my shoulder with the burning pain so it's quite possible. I am currently undergoing stellate ganglion blocks in my neck to try to help with the pain. I am not on any meds. The blocks so far have not helped but I've only had two. As for the procedure of having the blocks I was very nervous but can assure you it is very simple and nothing to worry about. My dr gives me a mild sedative, does the injection, and I'm awake and out the door (with a driver) within the hour. My arm has been partially numb after each one for about 12 hours. Good luck to you!