I am in a similar situation. Pain in both legs (upper and lower) and tingling and pain in my feet since April. I was symptom free for about a month but everything returned and has been bothering me everyday for over 2 months now. I have seen neurologists and other specialist and had pretty much every test, exam and blood work imaginable. I’m waiting on a few more results and if those turn up negative I’ll be pushing for a skin biospsy, even though both neuros are convinced I don’t have SFN. It’s starting to impact my quality of life, consuming my thoughts and I can’t physically do as much as I could months ago which is concerning. I hope things work out for you, hang in there and keep everyone posted on your status.