Have you tried IVIG? It helps with nerve regeneration. Mine is autoimmune but in college in anatomy and physiology for RN school you are taught that nerves do not regenerate. The only thing in the body that can regenerate is the liver. What neurologist do not tell you is about what happens when it moves into your heart or paralysis. I have learned from watching these seminars they are very basic. I watched two and they were very frustrating. In Israel there has been nerve regeneration with medical marijuana.
Also Dr Oaklander talks about it on YouTube.