Previously I'd gotten just pain and nausea without much in the way of visual effects. Today was a little different, though. After coming home with Marissa on the final round-trip out on the snow-covered roads, I noticed that I was having trouble seeing the computer monitor. It felt too bright, and a small off-center part of my visual field was occluded, sort of like I'd been staring into a bright light and had the afterimage. It didn't fade as fast as I expected either, but I thought I was just snowblind after too much white.
Now I wonder if it was a pre-migraine aura, because about an hour later I felt awful and had to spend the evening lying in the dark.
(After about 3 hours I was still hurting but my brain decided it was bored, which was not fair at all because whose fault was it that I was not able to accomplish anything interesting?)