Just to reiterate what Ragtop said...improve your diet. More specifically, cut back on sugar and carbs in general, as well as processed food. Higher blood sugar levels are an insult to nerves, and you can have issues in that area that are undetected by the normal diabetes screening tests.

I'm not nearly as miserable as I was last year with my SFN, and I can only cite my improved diet and maybe two supplements as being the cause of improvement. The supplements are high quality fish oil and R-Lipoic Acid.

I suppose I should also add that I have less anxiety about the condition which is also helpful. Anxiety will make it 100 times worse for me.