Did your symptoms come on abruptly or did they come very slowly? Mine came very slowly over a 10 yr period starting out with just a numb big toe for a year or 2 then bottom of feet feeling weird for about 2 years then top of foot then ankles etc. It seems it must be some type of missing nutrient the way it progressed but have not found a cause with numerous tests. Both legs are exactly the same so doctors say it is systemic rather than caused from my bk or other structural cause. All blood work is good except hyperthyroid which causes me no symptoms and normally only hypothyroid causes PN so does not seem to be linked. I sure hope you find a cause.