I had neuropathy start when I was travelling in India, I'm 29. Started with tingling in knees then spread out of control when I did some yoga. Doctors told me it could have been some kind of infection. It did start getting better by itself a lot about six months after, then I tried some diclofenac and it went back downhill again. Has been about a year now. I think it can start due to pathogens sometimes, but there are so many possible causes. I'm on lyrica and it helps me sleep pretty well, gabapentin is a similar drug. I'm currently waiting it out and hoping it will pass, I have a neurologist appointment in about a week, they sent me to a rheumatologist first who sent me to the neurologist. They did b12 and diabetes tests and I was fine.