@cecelia19 I am so sorry you are having such a hard time.
I think most of us who have PN have or are feeling like you do. It’s a tough situation for all of us. It seems there are so many causes, and no answers for any of them.

I have polyneuropathy caused by an autoimmune disease that damaged my arteries which in turn damaged my nerves. That happened 9 years ago. I tried Gabapentin, and Lyrica. They put me to sleep…

Undoubtedly, for me the best thing is ALA, (Alpha Lipoic Acid). It was recommended by my doctor, and if I forget to take it my feet and legs remind me!
It’s an over the counter supplement that you can buy just about anywhere. I get mine on Amazon. The brand I use is “Doctor’s Best”. It’s not cheap, but it works. Two capsules works for me.

You are not alone with your pain and frustration.