Yes, I have am EMG and nerve conduction study. They were normal. I have not had a skin biopsy. I am trying to get that accomplished. I have been reading how burning in your back in not normal for neuropathy. It scares the crap out of me!!!!! I want to see my kids grow up and be mobile!

I have been wondering if you have tried Lidoderm patches?

Applied to your back, where you know you have that problem, might be helpful for you.

I found for myself when I had terrible thigh pain..called Meralgia paresthetica, from my abdominal surgery, nothing helped it.
Then Lidoderms were approved here in US and I got my doctor to give me an RX for them. Two weeks of very day use (12 hrs on 12 hrs off) and these patches actually put me into a remission!
I guess the nerve was just firing because it couldn't turn itself off. (cutaneous lateral femoral nerve)
I found that applying them at the high point of the thigh where the nerve exists the abdomen was the best spot. I think Lidoderms work best where the "source" of the pain is and not where it is "felt".. which is typically a referral location and not the direct target.

So I think you should try this. They are expensive if insurance won't cover them, but really they were amazingly helpful for me.

Just to add my two cents, my small fiber non-length dependent neuropathy was Dx'd by skin punch biopsies.

The Sjogren's was confirmed somewhat after that.

I eventually had a follow-up appointment with the neurologist who'd done the biopsies that identified SFN. Prior to my visit, I'd found on-line the paper she'd published about small fiber non-length dependent and its link to Sjogren's.

Imagine my surprise when, after reviewing my case, she said that my neuropathy was "idiopathic." I just sat there and looked at her, and have not gone back for any more neurology appointments.