| Emm has a good point--you might be developing an infection that hasn't made itself obvious yet. The last time I had a urinary tract infection, the only symptoms I had at first were unexplained high blood sugars. It seemed like no matter what I did, I was getting readings over 200. After a week of that, I developed the usual urinary tract infection symptoms (I'd had them before and knew immediately when one was starting). My endo suggested that the next time I had two or three days of unexplained high blood sugars, I should come in and have them do some bloodwork that might help track an infection. Maybe you could try that?
~Lisa | 
