Debi,
don't know if you have ever seen these treatment guidelines from a famous pain doc, dr forest tennant. it has been helpful to me. he updates it periodically( don't know why this one has silly cartoonish characters...have a feeling a grandkid or someone did it for him.)
http://www.foresttennant.com/pdfs/In...free-hours.pdf

I have been on and off gabapentin and Lyrica for neuropathy....currently on low dose lyrica which is the only med that seems to help soften neuropathy pain.
My doc gave me Nucynta last year but, I generally stay on Norco ( 10 mg hydrocodone and 325mg tylenol), soma( muscle relaxer ). I also generally take an anti inflammatory...currently it is mobic.

Have you tried Fentanyl? Anti depression meds for pain like Elavil or Cymbalta? Ketamine or lidocaine?

Best of luck, I know how dispiriting it can be when we take pain meds and are still in pain.
You are in my thoughts and prayers.
D.