my PN started exactly like yours, numbness in the left big toe. I was 44. It has now spread up to my knees bilaterally and also in my hands bilaterally. In the first few years even though my feet were numb, if i stepped on anything or banged them the pain was all out of proportion to the injury. Fore the last few years though my feet are dead numb though i still get shocking and squeezing pains and when i walk on them i feel like im walking on broken bones. From emg/ncs my PN is sensory motor axonal with demyelination. My cause is toxins. Were you exposed to any toxins?