Well, I'm no expert, and not a medical professional, but I really don't think that SFN is controlled by diet. You may 'feel better' over all with a gluten free diet, no alcohol in your diet, but damage to your SFN isn't related directly to diet. Some of the pain of neuropathy related to either diabetes or Celiac Disease can be eased by changes in diet, however.

A dietary intervention for chronic diabetic neuropathy pain: a randomized controlled pilot study

Small-fiber neuropathy/neuronopathy associated with celiac disease: skin biopsy findings. - PubMed - NCBI

I take 3600 mg of Gabapentin, daily, to manage the pain of my SFN.

It is suspected that both my profound PN and my SFN are the result of attacks by my Disordered Immune System, probably using Cytokines. I have other organ/system damage, as well: moisture system (eyes, mouth), lungs, ears, bladder.

Do you know what causes your SFN?

Regards, ElaineD