@nukhan
I had burning/tingling/pins and needles start in my feet back in 2017. I also had some numbness in my left calf. My list of weird symptoms was long and I saw many specialists. I did see a neurologist who did a skin punch biopsy (took sample from thigh and calf) which confirmed severe small fiber nerve damage. It was considered to be idiopathic (no known cause). I had upper and lower EMGs and nerve conduction studies. You may need those tests to check large nerve fiber function. My central nervous system and peripheral nervous system has worsened since then and I now have weakness, numbness, etc. in arms, hands, legs and feet. I am going to ask for updated testing. You want to try to stop the progression of nerve damage because in most cases it is irreversible.