There was an excellent site on neuropathy which disappeared after the owner died and I haven't found if the information has been put up elsewhere yet.
Apart from tight BG control, like never spiking over 8 or so, the protocol was Alpha Lipoic Acid 300 - 600 mg/day and Evening Primrose Oil 500 - 1000mg. This seems to have helped mine, and over a long period of time some of my autonomic neuropathy symptoms have also improved. There was also a discussion of benfotiamine, a derivative of thiamine (B1)