First thing you have to do is relax. I know that in the first year of my PN (which is still - idiopatic) I was running to see and be checked by many neurologists here, some of them PN expert and they didn't know what to say. I did a lot of blood tests to eliminate some other background illness - and everything came out - normal - which is good. If you are thinking that it might be a prediabetic - keep your diet to prevent the real diabetic stat - you can tolerat it by eating properly. There is a book "Ultraprevention" by Mark Hyman and Mark Liponis. To my opinion - it is a good book with good ideas. And about the pain and burning - our brain has to "learn" the new situation and after a while - you will feel it less and less. I have to look for the article explaining this and I'll add it later.
Rest, eat properly and don't be panic, do exercizes, breath clean air as much as possible. Read what David wrote a while ago (Wing 42) and hope that one day - you will recover completely. Good thoughts bring good conditions.
(I sorry my English is not good enough to express myself properly...)