I’m pretty sure that yesterday I had a visual migraine. The kindly elder doctor on that page describes precisely what happened to me and his nice friendly face and very informative article reassures me that I probably do not have a brain parasite. I had been knitting and I hadn’t really been paying attention to the sort of swimmy motion going on in the peripheral vision to the right of me; I just assumed that things in that corner of the room were really… uh, busy. Then I realized something was up and I FREAKED OUT just a little.