Have you had a full rheumatology work up? All the neuros really did for me was to to blood work/ spinal tap/ MRIs and skin biopsy. They cannot find a cause. Unless you have diabetes or a classic autoimmune disease or vitamin deff. they basically are just able to tell you that your nerves are being damaged/attacked and give symptom treatment. There is a lot of good advice all over this site and a lot of help. Probably more than you will get from any doc unfortunately. I keep searching and getting opinions though.