Welcome to the boards though I am sorry for all you have and continue to go through.
It is good you have doctors who you feel are educated though sorry they lack communication skills. Do you have your records? I would get them and keep them in a binder. Also with the doctors notes. Then maybe you could ask specific questions from those things stated?
I can understand the worry because I live in that and causes anxiety. I see a psych to help with that and may go back to therapy. Have you thought of that?
I am not an expert like some on here of causes etc but did your doctors feel the past with cancer etc is impacting now with the neuropathy? Have they refered you to a pain doctor? I hope that you find the PT helpful and get some answers/relief