I don't know about CRPS as a label for what ails you but I can tell you that I have damaged nerves emanating from my spine. I had surgery so they were released but they are still damaged. It can take 10 years for nerves to remodel. I am on year 7. I don't have much hope. I have pain on my left side down my leg. At different points. Some tolerable some not. What I found helped is riding my stationary bike for 90 minutes every day (at least 45 minutes) and walking twice a day. Basically, keeping my circulation and metabolism strong and active. Also exhausting myself so I sleep deeper at night. I use topical creams (diclofenec 3% and lidocaine 4% and Sagely Naturals CBD "circulation" deep recovery cream I like a lot. (buy on sale 40 or 50% off). I take a low dose opioid for my lumbar back pain which only works on my tailbone pain. Cortizone injections help once in a while because we've located the exact spot where the nerves were crushed which is where the pain comes from. I don't believe your CPRS would spread if it is because specific nerves (which you just said were damaged) are the reason for your pain. A lot of people use nerve medicines but they never worked for me. I hope you will continue to search and find relief. (I have my artwork and dog to keep me happy during my bouts of intolerable pain.)