I don’t take medication for CRPS; I have a Boston Scientific implant. Instead, I manage my condition with diet. I recommend watching Dr. Philip Getson’s videos on YouTube, as they were highly recommended to me by someone else on this blog. Pay particular attention to the diet section. Stop the Inflammatory foods. The main idea is to avoid anything that is white, such as sugar, flour, rice, and white salt. ( Yes, you will have a sugar withdrawal but it doesn't last long. Headache. I ate a small piece of candy each day for a week, then went every other day for the next week and then stopped completely. Additionally, avoid red meats. Omega 3 fish; chicken; turkey. Dr. Getson is very knowledgeable about vitamins and offers valuable insights on exercise as well. Also, steer clear of nightshade fruits and vegetables. I haven’t looked into his thinking about a nerve block but it is a thought, too. This man is a wealth of information. Good luck.