I've actually been doing some reading. It looks like the (opposite) problem to diabetes - hypoglycemia (but minor & not "officially diagnosed" or a daily occurance for me). A lot of things pretty much make it sound like I'm not eating enough sugar-intensive stuff before/during the exercise, so there's not enough sugar in my blood stream for my muscles to use. (They recommend loading up on carbs, fruit-juice, gatorade, etc.) Hypoglycemia would also explain why I wind up taking an insulin-overload nap for 3 hours (whether I like it or not) after eating ice-cream. (Too much insulin is released to handle the sugar). Diabetics, however, have too much sugar in the blood, and not enough insulin to regulate it. In any case, it seems I'm a bit off-balance, which doesn't make me happy.
As for the handle-bars, etc., I have a hybrid bike, and I'm sitting pretty up-right. It doesn't happen every time I ride, just when it's first thing in the day for me. Maybe it's not enough time for my body to absorb breakfast before I set off. That could be why it doesn't do that in the gym, too - I usually go at the end of the day. *shrug* It could be any number of things, which is why I was wondering if anybody else had a similar phenomenon happen to them, and under what circumstances.
I've been having one heck of a time trying to balance everything this time around losing the weight, because it seems everything I do is wrong. I try to lower sugar-carbs and I end up needing them. I try to lower fat, and I wind up with painfully dry skin. I try to cut calories, and I've cut too many and stop losing. Argh! I don't remember it being this hard the last time! (Then again, I was in such lousy shape ANYTHING I did made me lose weight then.)