Have seen my gp about them, they're definitely migraines i have a sort of visual aura creating a blind spot for about 30 mins then the headache joins and i feel extremely nauseous. I do believe they are defently exercise induced but only happen if I don't eat within 1-1:30 hours after, however i have also found its only happens before breakfast. So, for example, i do a 3-4 mile run in the morning then have a small breakfast (2 pieces of toast) i would get one but if i did a 3-4mile run at say 11am or 3pm (after meals) i would be fine. Also i dont get the migraines if i have done a 3-4mile run then have a considerable breakfast (egg,toast,bacon etc) but i can get migraines if i do a run for 8 or so miles on an empty stomach. Just wondering whether i would be likely to get them during training. thanks for the responses .