Sorry you have CRPS. I know people who have had each of those therapies. I have had Ketamine infusions myself. I think for me anyway, I had to do the least invasive of the things to try. The ketamine did work for me, for the condition I have for a period of about 4 months with good pain relief. This was done under fluoroscopy. Good results have been published through JAMA, and are available at your local library. I wish you all the best. ginnie