You asked what worked for me. I take Tegretol for my burning pain. You can read my story about that on here. Basically my neuropathy pain started when I stopped taking Tegretol in 2014. I had been on it for many years (30?) for complex partial seizures. It took me years to connect these two things. I tried all the standard neuropathy drugs. A few years ago, I asked to try Tegretol again. My burning pain is 90% controlled.
As far as why I’m getting weaker, that’s harder to figure out. When I’m active, every tiny muscle is screaming. The neuropathy is progressing, as expected. My sister has the same symptoms.