I have a bizarre idiopathic dysfunction that mimics diabetes at times. Mostly, my blood sugar is incredibly LOW. . .I rarely make it out of the sixties. But from time to time, it'll sky rocket for no reason. Just bam. . .and I'm at a 350 with no warning. But, I have begun to notice the difference in smell. . .and it is a fruity smell. Kind of reminds me of juicy fruit, but like, amplified. It's weird.

Your doc should be able to figure something out after the GT.