1 out of ten times i get on a plane, ill always end up having an extreamly bad headache towards the end of the flight all the way til it lands. then remenicances of it stays with me for hours after that. its almost unbearable at its worst. anyone knows what actually causes it? pressure? its nothing to do with my ears, just temples. and its slightly different in feeling compared an exhausted kind of headache. ive tried everything. but nothing seems to work. anyone know how to fix it?