If you have damage to the dorsal root ganglia, from the vaccine (the adjuvants in it most likely), or a contaminant in it...(it happens), it might be there that the damage is. It takes a while for the skin biopsy to reflect that.

There is a special MRI to visualize the dorsal roots:
http://neurotalk.psychcentral.com/thread147771.html
This link has more information.

I assume you had B12 tested? And it is above 400pg/ml?

Have you tried some magnesium? It can be low in many Americans. Magnesium is a NMDA receptor antagonist, and blocks pain signals. Some people find magnesium fixes many many symptoms of PN.
http://neurotalk.psychcentral.com/thread1138.html

Do you have swelling anywhere? Swelling that comes and goes?

Do you take any RX drugs besides what you mentioned? Drug induced lupus will not show up in ANA testing.

You won't like this, but continued use of benzodiazepines, will lead to more pain. This happens as the last dose wears off. They are inhibitory for certain GABA receptors, and lower the threshold for pain briefly over time. So what works well at first, becomes less effective, over time, and leads to higher doses, then habituation, then a terrible painful withdrawal. Short term, yes, it is seductive. Long term = things get much much worse.

Vaccine injuries are very difficult to prove. But they do happen.
Sometimes they fade over time. But the medical community is not much interested in them, or in preventing them, or helping them. That is just the way it is these days.

See if you can pass on the next vaccine if possible. But with hospitals mandating them now for employees, that might become difficult.