Many times, it is a combination of things. I am so glad you found your Vit D problem and I hope it is normal now. Finding these problems help so much. Not just the nerves, but the whole body.

Even with good glucose testing, stop sugar and simple carbs. You can still eat wonderful foods. Dark choc. for one. I make my own with dark choc, Cocomanna (Whole Coconut) and a small amount of coconut palm sugar. I put it in molds over nuts and also in other molds with peppermint oil. SOOOO healthful and delicious.

Sugar tastes so good, but it is so bad in every way, that includes the carbs that are just like sugar. Breads, processed stuff, rice...

If you don't mind me asking. Were you diagnosed with peripheral neuropathy (unknown cause) or actual MS?