Colby, elavated blood sugars caused my PN as well, mine started at only prediabetic levels but i know i found it impossible to walk the pavements for exercise, just to painfull to do, so i opted to go to my local indoor pool and just walked up and down the lanes early in the morning, this give me no pain what so ever.
When your ready to claim for Disabilty, may i suggest to look in the stickies there is a post by DanP .." Help with applying for SS disabilty ".

Brian