Hi Mark, my PN hasnt gotten any better, it has changed from numbness and pain to more numbness and less pain. The main pain ihave these days is when i am on my feet , i get the broken bones feeling in my feet when i stand and walk. I was exposed to a very high concentration in a short period of time plus exposure over many months. It has not spread to any new areas in at least 2 years. As with everything with PN, it affects people differently and acts differently. Its impossible to predict what will happen over the long term. If you take care of yourself and stay away from as many toxins as possible, it is possible that you may begin to heal.