If you have found the cause of your PN, in this case diabetes, controlling your blood sugar is the best bet to slow down the progress.

I haven't been able to see the neurologist yet. I'm sure the wait is very long. I'm still working full time these days even though I'm dead tired due to sleep deprivation. My arms and hands are tingling and burning, but I'm still cooking, doing light yoga. But you're right. The uncertainty of the future is what I'm terrified of.