I had minor pre-existing nerve damage in my feet from an antibiotic that did not affect my life and had been stable for years. At the time of my first Pfizer vaccination, I had been walking 9-12 miles per week without issues. Two weeks later, I developed toe spasms, which then progressed to sensory and motor peripheral neuropathy. (My first EMG was essentially normal.) The likely cause is an autoimmune response triggered by the spike protein encoded by the vaccine. My ANA titer was increasing at the time that my symptoms peaked. A great source of information about vaccine injuries is the Neuro V Long-Haulers group on Facebook. There are about 3500 vaccine-injured members.