Is this one doctor you are seeing and if so what speciality? When I was first going through dx testing my results did not show and then I had a repeat of my nc/emg and I was dx with PN. I have had every test basically under the sun and the why is still unknown. My symptoms came on very quick and then spread. I will say for myself looking back at the 2 years before I had odd problems for ex I had super tight calves and also was sick monthly for a couple years with a fever. Can you identify anything in your past that maybe you brushed off? For ex stomach issues, other illness,etc?