I am 77 and have had PN for 13 years. During the last six months tingling has moved from toes to calves. Also, my quads feel sore after walking and getting up in the morning. There is some it band pain. Legs feel weak. Back is also sore from previous herniated lumbar disc. I am afraid to stop walking despite pain and weakness. No can yet. I walk everyday a few miles. Do you think my quad pain is overuse and not PN. Do you feel exercise slows the progression. I fear losing mobility while trying to take care of my wife with early dementia