I agree with Ladybird that you need some answers here. But for what it's worth, I thought I'd chip in that my son was in hospital a year before diagnosis on another matter, and had a high blood sugar (they didn't tell me what the level was, just that it was high). Told to take him to the GP the next day for a follow up test, and it was back to normal. He may also have had a hypo a few months before diagnosis too, although we don't know for sure. He felt faint in games, went cold and shaky, and then went to sleep in the medical room for an hour or so before feeling fine again. It's good that you're so vigilant. I hope your grandson turns out to be fine.