I have been having headache mostly back size multiple times a week from last 10 years or so. Over the time I have consulted with many experts; they classified the headaches as a migraine. However, their diagnosis did not have any relief. 5 years back I had done a CT scan of the brain and I was clean. triggers for my headache: Not taking food on time; getting hit (even mild ones) by something; inadequate sleep; odours; excessive sleep; even a slight gastro.