I wasted 2 years in San Francisco from all the persons with HIV telling me do do different herbal treatments, Chinese Rx etc. These helped 0.00% - Zilch. You can't stop your white blood cells killing your nerves via herbs.
However, over the years, for every 100x people told me they "swear by" some herbal treatment, usually on my own, with no help from the "holistic" people, I managed to find an herbal product that WAS beneficial for one of my hundreds of conditions that were caused indirectly by nerve death / die off.
You need to do your own trial and error, because everyone has different body chemistry and DNA; but you won't find an herb re-orientates your immune system and changes your DNA.
It's widely reported that SFPN kills off the sweating nerves but it also kills off nerves that support other elements of skin including re-growth. Dermatologists were always the nicest MDs yet none ever gave me any useful advice on this matter. I have found the best option is the very expensive (again, rich person's illness) Strivectin-SD helps skin thinning which you will be alerted to by severe itching and maybe MDs. The 2nd best is inexpensive, or even free depending on where you live - Fresh Aloe Vera leaf, applied often.
While I require a more recent expensive acid medication for reflux (both "acid" and "non-acid" ) if I want to live, if I want to talk to an MD and not get a sore throat, I use Deglycyrrhizinated licorice lozenges "DGL" which you can suck on to reduce reflux destroying your throat for occasional longer conversations. Sipping herbal tea also helps.
If you have or think you will get severe diarrhea (and with nerve loss you are likely to have problems in both directions), you can experiment with Slippery Elm Bark Powder Capsules that you take with food. It is gentle and generally non-constipating.
These are a few off the top of my head I use but if have GENETIC SFPN and you approach me politely with a name, last name, location, and share a few things alla Victorian emailed letter, I am an open book when I am well enough to respond to letters. I do not use any "Social Media" beyond computer mail - so I am not the person to hit up with text or half-sentences or emojis, please. Consider via pre-aging I am in 2022 now 88 not 58 even if my birth certificate says otherwise. I get to messages when I feel well. I am not very private. Little bit of Bert (maybe a lot of Bert) and a little bit of Ernie: MarkLazersonATLiveDOTCom