Hi Nina
I am in a similar situation to you. All the tests and nothing comes back, other than low on B12 and Iron. Mostly pain in the feet, however lately starting to get that sunburn feeling on my arms and legs. So, although I am on the same journey as you without success yet, things I'm trying are:
1. Gluten-free diet. (Gluten Intolerance can lead to Neuropathy).
2. Sugar-free diet. (I am not Diabetic either, but sugar & nerves don't play nice together).
3. L-Lipoic Acid (excuse the bad spelling please!). This seems to help some people, definately worth a try.
As Ken said, please keep us informed. Many of us get much more information from these forums than from our Doctor's. Docs can't be expert on everything after all, but we can be expert on this!
Hope you find peace soon. Lovely to meet you!! Just a shame it's not under more pleasant circumstances.
Debbie