Exercise is beneficial I have found. I have long fiber PN diagnosed as idiopathic. Although doctors don't know cause common sense tells me there is some cause. Except for this I would say my health is absolutely great at age 71. With daily exercise I have managed to stay very active in spite of "walking on rocks" sensation and stiffness and pressure in toes ankles and now up my shins. My balance while standing on one foot is only slightly off. There are things that help heal nerves even long fiber nerves. Keep moving all you can. Request physical therapy and continue it at home every day or even 2x a day I wish you the best!!