The three punch biopsy sites on each leg help determine if your SFN is length-dependent or not. I wouldn’t spend a lot of time studying about those differences until you get the results. Then you can zero in on the type you most likely have, and learn more about the treatment that works for it.

As far as meds go, I have concluded, after years of trial and error, that medications are probably necessary. You may end up trying lots of different meds for this nerve pain. And what works for you will probably change over time. I suggest that you pay close attention to your body and any reactions, both good and bad. Make some notes, or even charts, if that works for you. Prepare to spend some time (and money) on physical therapy, massage, acupuncture - whatever works for you.

If someone tries to tell you that something you did - (like your diet, or excess weight, or lack of exercise, etc) caused this, just politely shut them down. You didn’t cause this, and a well-meaning friend or family members with some articles cannot cure you. If that were the case, no one would need to be on this forum!