I am sorry about your pain. Welcome to the boards though this is a very warm community.
I do feel it is important to rule out other conditions. Some like myself have multiple conditions going on. Has your doctor suggested seeing a neurologist or have you? I would see one and get in asap. Items like mri,emgs,etc may be needed.
Many doctors have a different view on how tests,procedures or symptoms will dx rsd. Is the pain doctor you are seeing one who deals with RSD a lot? If you do have RSD I feel this is very important.
I hope you get some answers and relief