True. I get scintillating scotomas.
http://en.wikipedia.org/wiki/Scintillating_scotoma
Have had them on an off since I was a teenager. Never have a headache afterwards, but they can be quite disruptive. If I get one while driving, I need to pull over. Can't read or use the computer during one either. I usually just close my eyes and let it pass.
Lime, I agree you should see your doc. It may be nothing, but better safe than sorry!