Hi Sallya,
Welcome to the NeuroTalk Support Groups.

I'm sorry for the reasons that bring you here.

I wondered a couple of things when I read your post. I wondered if you also received any Targeted Therapy, Immunotherapy or Chemotherapy that may have compounded the degree of nerve damage? [My own PN journey originally began almost overnight from a combo of two Targeted Therapy drugs].

When you say your gait is better on grass do you mean that your feet aren't as wide apart for stability? Do you mean with shoes on or bare feet? If bare feet, I wonder if it's to do with proprioception.

If you get time one day it might be worth reading some of the older posts/threads particularly about shoes and safety tips for balance problems.

There's a search function where you can search any keywords you want to and you can click to search on the Peripheral Neuropathy Forum and/or the PN Tips,Resources,Supplements and Other Treatments subforum.