I didn't have vertigo, but when I got up to walk around, and especially when I looked down, I got dizzy so much that I had to look up again or risk falling over or passing out. It's gone away slowly as the day has progressed, but that was *weird*. I went through a liter of water over the last few hours, so that may have helped. At any rate, it was strange.
One thing that cross my mind - and this may be a red herring - is that I tried one of my newer homebrews last night. This particular batch used a few ounces of homegrown hops, and these hops were probably sprayed with chemicals to keep them healthy. I did rinse them before drying them out for use in beer, but maybe some of the pesticides stuck around? Whatever it is, it was *strange*.