From joezydeco's follow-up comment from a few hours ago, it sounds like there was a window of concern for several hours before boarding the flight. At any rate,

From joezydeco's follow-up comment from a few hours ago, it sounds like there was a window of concern for several hours before boarding the flight. At any rate, there was no mention of this being sudden onset. Just encouraging people on this site who don't have a medical background to understand that there are indeed emergencies due to hyperglycemia/hypoinsulinemia.