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They only happen very infrequently, i used to get them all the time when younger after playing football on a sunday, then i found out if i ate a chocolate bar at half time it fixed it. i thought i had grown out of it as its pretty rare it happens now. Woke up this morning and still got the headache, though only if i move my head fast or cough (which is bad as i have a cold/chesty cough atm).