Re: Skin Punch Biopsy....
I had mine done at Johns Hopkins. Usually 3 areas are taken for samples. Mine was ankle, thigh & hip.
You seem to have switched meds quite quickly at comparatively low doses. It makes me wonder who has been demanding the changes- you, or your doc?
Usually 1800-3600 mgs of Neurontin (gabapentin) is the daily dose, and it is titrated up over at least one month's time to arrive at the desired level.
Lyrica is minor at 300mgs/day.
You don't seem to have been given a combination 'cocktail' to affect the symptoms & pain. Usually a pain med (like Tramadol) iis given, along with the Neurontin or Lyrica. This can be up to 400mgs/day in divided doses.

Seeking a consult with the chief of neurology at the hospital, is a good thing.
My neuro is the head of the dept at Hopkins.
There you will have available the whole dept of neuros, one of which should be a PN specialist.
He's the one to see, and the one to start you on a serious regimen of meds.
You've got to titrate up to levels that work. I was up to 4200mgs/day of Neurontin (& 400mgs/day Tramadol) before switching to Lyrica (600mgs/day) & Tramadol.