The answer to that is finding the root cause of your PN, and that wont be easy, nor will any doctor be very beneficial. You are your own best advocate, so you will have to become a professional on the subject of PN and you will have to dig, dig, dig, to find the root cause.

Once you find the root cause decides if you can heal or not. But finding the root cause is not so easy.

I do believe nerves can heal. There is another post asking this same question from years ago, its a long post, and a good read, use the search engine here to find it.