Sorry you are having such a flare. I am not sure about Medicare. I know my insurance will not cover ketamine and I will have to pay out of pocket. I have heard some depending on where they go getting coverage though. Some doctors like the one I may see does not even accept it but I think you can try to summit it on your own.
How did the fracture happen? Were you doing better before that with the RSD? If so what do you feel at that time was helping you? Do you have a pain doctor that deals with RSD and what is there thought on treatment?
Hope you feel better