I don't have diabetes but my PN was a rapid onset. The symptoms over the 4 years have changed a lot too. For ex at the start I did not have burning but now do at times etc. Have you been tested for other conditions like auto immune etc? Have you talked to your doctors about pain control? In terms of activity I think starting very slow and finding the best activity for you which may different from someone else. A lot of people like the pool though I don't. I hope you get some answers from your apt