Thanks, Catrin. Yes, my body's definitely having a hard time adjusting to the temp differences. It was 40 degrees two weeks ago. Today the forecast says 98! I do bring a sports drink with me when I ride, but it might not have been enough that night. IF I ride tonight (severe thunderstorms predicted, but you never know...) I'll be taking 4 bottles (2 in my cages and 2 more in my jersey pockets) with electrolyte tablets or sports drinks in at least 2 of them.

The good thing about what happened is that, knowing how horrible it feels, I will never let it happen again. Experience really is the best teacher!