Firstly, welcome to the forum.
I have peripheral neuropathy, so have a little knowledge about it.
With me, no effected area has ever come & gone.
Once it's there it remains & progressively gets worse.
If you have areas like that I would suspect a pinched nerve.
If indeed you do have it, you need to find the cause.
I may have missed it in your lengthy into but have you been tested for Diabetes.
It it quite often a cause.
In my case it turned out to be Sjogren's Syndrome.