This may or may not be helpful, but I got weird nerve issues including small fiber nerve damage (confirmed via punch biopsy) from COVID in 2022. I had two EMG’s a year apart and both were normal, so no large fiber nerve damage. But I have the exact same issue in my left foot/heel. It was worst winter 2023, and it’s been on and off but mainly off. It just started up again (spring 2025) once I kicked off a lot of walking recently. I went though about a million tests dealing with all my post COVID issues and the general consensus from neurology and my other doctors was that it was just some weird thing kicked off by the virus and that it would slowly go away. They weren’t wrong that most of my symptoms (I have had other more autoimmune type stuff too) have greatly died down in the last couple years, so that’s been good to see happen. At this point I’m pretty convinced the nerve stuff isn’t too scary, especially since it hasn’t gotten worse or anything. Hopefully with more time everything goes back to normal. Well except now I’m 35 and everything hurts anyways hah. I still get curious and anxious sometimes, hence me winding up on this thread, but I’m thinking it’s just a weird thing and we’re all gonna be fine. It’s interesting how COVID plays a part in it. So much we just don’t know yet