I just want to day sorry you are going through this.. you sound like you are at your wits end! I don't have advice about disability but just thought I should mention that if it is rsd you really shouldn't immobilize your arm. Doing do can make it worse. I know there are days I would like to get in a wheelchair and not have to walk on my foot! Unfortunately its important with rsd to keep moving as much as possible. Just speaking from my experience and what ive read. Hope you find some relief and answers soon.