I don't get migraines, although my Mum once went through a phase of suffering from them. When I had my DD1 (now 11) I had an horrendous week of them. One after another for a week, getting slightly less intense each time. I put it down to hormones.
Every now and again (6 months to a year or so) I get a short spell where I have visual disturbances. It starts like the aftereffect of looking at a lightbulb, then grows and spreads. I can't see very well and what I can see is over bright. I have trouble focusing and reading as a lot of my sight is interrupted by tv-interference style flashy zig zag lines.
When they were every now and again I didn't worry about it, but today I had my second one in a matter of weeks. They are short lived and annoying. I'm wondering how frequently they have to occur to be a concern.
(Selfishly I am aware that one of the first things that would happen if I went to a GP would be to be taken off the pill- which would be an inconvenience to say the least)