I was put on Amitryptyline 50mg for a very similar reason about 5 years ago (just turned 40 then). I felt a very sharp pain in my left instep while running one day. After that it was going numb, tingling and burning. I was running really well at the time and didn't want to stop. I felt the drugs did help reduce the symptoms and I could run but I didn't like the other effects, which for me were a very dry mouth, feeling sluggish and constipated. I came off them pretty soon. I got used to the numbness and tingling and it gradually reduced over time. I barely feel it now but can tune into it.