> There is a sort of migraine you can get which doesn't give headaches. My mother has often reported getting bright zigzaggy lights, sometimes in a C shape. Thinking back, I remember she used to get them years ago.... but it worries her more now and can set off her anxiety.
Just wanted to comment on this, in case anyone's reading it and wondering about them :-) These are visual or optical migraines, I've also seen them referred to as aura migraines. They aren't always painless but a lot of people do have painless ones, myself included - I get a small spot of moving/flashing zigzags off-centre in my field of vision, this then slowly expands in a ring with the middle being not-quite-blank (I can't see but I can, it's kind of hard to explain) and keeps going until the zigzags just go off the edges of my vision and that's the end of it.
I get no other symptoms, just the visual but some people get nausea, headaches, pains elsewhere or it's one of the symptoms of a full-blown migraine. It's harmless though, and like normal migraines it can have a specific trigger - mine don't, they just hit randomly 2 or 3 times a year. They don't stop me doing anything and last 10 or 20 minutes. I did have to stop last time I had one - I was doing something with numbers and although I can sort of 'see' while one is going, small details like figures on a page were a bit too much that time :-)