Hey complicity - I'll agree w/ the other posts that you should get out to see your doctor, but it might not be as alarming a situation as others have indicated.
I had a very similar experience back in college - vision just started going haywire for about an hour, and then I got a mind-numbing headache. Found out later that it was my first real migraine headache, and that vision distortion is a common precursor to the onset of the headache. Now when I get them I pop a couple of Advil/Tylenol/whatever, and try and find someplace quiet to wait out the vision weirdness. If I can get a nap in, I'll usually miss the headache part altogether and be fine when I wake up.
All the same, a doctor's visit is a good precautionary tactic against anything more serious.
Good luck.
This comment was edited on Dec 22, 15:00.