Well, I managed to work an hour and a half before getting today's migraine. Now there's excitement for you.
Speculation at this moment: bad posture, CRT radiation, other radiation (cell tower, wi-fi, etc.), pregnancy, oversleep, insufficient air supply when sleeping, chocolate (yeah, I had some last night), tylenol withdrawal (is this possible?), reaction to supplements.
I'll be keeping a food / sleep / activity journal to track this down. This is definitely a crappy start to my exercise plan.