A lot of us here don't know the cause of our neuropathy either, so they call it "idiopathic", which means they have no answers for us, other than just deal with it. Even if a cause can be determined, once the nerves have been damaged, there's no treatment or cure, we're stuck with it for the rest of our lives.
My lifestyle has taken a 180 degree turn for the worse, and it's been 10 years of dealing with this crap now. I've seen 4 neurologists and had every test available done, sometimes on multiple occasions, and the results are always the same, no underlying cause can be found.
Sometimes we're just screwed by life.