DJhasty is correct. About the most promising of medications for CRPS is Ketamine infusions. Our wounded soldiers from the recent wars were the first the get this treatment. JAMA the journal of Medicine has alot of articles about this medication. I had an infusion of it in my Neck before I had cervial fusion.
It worked for about 4 months. In some of the articles, remission has been achieved. I don't know if it is available in your area, but maybe it would be worth a shot to ask your neurologist about it, and if it would be possible for you. I really hope that effective treatments can happen for all those that suffer with this CRPS. I wish you all the best. ginnie