Unfortunately, neuropathy without an obvious cause can be a long and frustrating road if you are looking for answers. My advice would be:

Have the emg/ncs repeated at a large teaching hospital with a neurodiagnostic dept. Having inconclusive results should get you a referral there as far as your insurance goes. Try to have all 4 limbs tested. Download the spreadsheets from www.lizajane.org. Get copies of all scans, reports, labs & organize in a binder. Take this with you if you can get a consult with a neuro at a teaching hospital. There are quite a few metabolic/autoimmune factors that can cause nerve damage.

Pay attention especially to B12 level and vitamin D. MrsD has stickies about these and tons of great information about supplements. Also do a search for mthfr mutation, a genetic mutation some of us have that affects the methylation pathways of B12 and folate.

Diet--cutting down on sugar and other simple carbs. You could try an elimination diet like the Whole 30 to see if it makes a difference in your symptoms.

Hope this helps!