Hi all, [ and hello to all of my old friends ] it has been some time since posting here but seen this post and thought I should answer it.
All peripheral nerves do have the ability to regenerate as long as the nerve cell is not dead but even then they can re sprout, this is only possible once what ever has been causing the damage has stopped.

I had mostly small fibre damage and some large nerve damage as well, the cause was being in a prediabetic state and low in B12as well.

I had burning feet and up the legs as well, the electric jabs and all that jazz, so once diagnosed I changed my diet to get the sugars down to near normal readings but it still took about 3 years to heal completely and not needing any pain killers at all.
regards
Brian