It was about a year ago that I had my first visual migraine and it was a most bizarre and freaky experience. I'll be honest, it got to a point where I thought I might be having a stroke, or that someone had spiked my tea with LSD. Many people have asked what it was like and as mentioned in the link below, it's difficult to describe, but not anymore!
It doesn't come on quite a fast as this, but happens over 20 to 30 minutes and really does feel like coming up on a trip. Then it stops and you have a bastard headache.
Anyway, serious hat tip to this blog for doing the flash. Have rehosted it so as not to nick his bandwidth.