I have never been near any COVID vaccines but ended up with neuropathy--may be due to some medicine I took for sinus or perhaps due to the infection itself. A salesman at my local appliance store has idiopathic neuropathy--he had long COVID plus took vaccines for it. He has severe balance issues and tried immunoglobulin therapy but to no avail. Perhaps you can add some vitamins to your regimen as well as doing physical therapy. And, yes, not all neurologists are the same so we must keep on the lookout for the sage ones!