Sorry to hear about all the problems your having. One of the first line medications that is commonly used for PN symptoms is Gabapentin.

Muscle twitching & cramping were the first symptoms I experienced. My neuro prescribed Gabapentin, and it does a pretty good job controlling the twitching & cramping. It also helps with the burning/pain for many people as well. (I actually started the Gabapentin before the burning in my feet started, so I'm not sure how much it helps me with that - although I do notice that the burning seems to increase if I'm late taking a dose.)

There are also several other anti-seizure or muscle relaxant type medications that can be used for cramping. And certain antidepressants that are commonly used to help with the pain. Many people require various combinations of medications. (Fortunately I haven't progressed to that point.)