Had you used any fluoroquinolone antibiotic in the PAST?
Cipro, Levaquin or Avelox? Or Flagyl or Tindamax?

The most common other PN causing drug are statins for cholesterol.

Sometimes exposures to several things/toxins in a row and concurrently can damage nerves until a threshold is reached when symptoms appear.

If you indeed have DNA damage, then the supplements for mitochondrial support may be of use to you. Acetyl carnitine, CoQ-10, R-lipoic acid for starters. I'd also suggest fish oil or krill oil for their anti-inflammatory actions.

I'd avoid alcohol in any form as it is vasodilatory as well.