I have taken aspartine tablets in my drinks for around thirty years, i have stopped now, and use brown sugar. my neuropathy improved?

See below: Not entirely clear as to what you are asking, as there is little to suggest aspartame directly causes peripheral neuropathy, but it does cause metabolic syndrome, which could include a diabetic response. If indeed this is your diagnosis, then you would distinctly benefit from the medical food, metanx twice daily, but response does take many months.