WOW Deb! I was having the same problem! Started about a year ago, about 1 episode a month...now has progressed to about 1 every day or so..mine takes about 20-45 minutes to stop. Just went to opthamologist yesterday. He told me I was having optic (optical) migraines! I'd never heard of this..anyway, have to go see my PCP. Doc didnt say if anything wil help, so I guess I'll see. I called the episodes "spinning pinwheels" only way I could describe it. I've had to pull of the road when I'm driving.