I often get severe headaches with dizziness , which mostly is accompanied by nausea as well. At times, it even occurs at a frequency of 5 out of 7 days a week. I do take medication for migraine. But other times it doesn't seem to be migraine headache since its spread all over my head. Often when I wake up from sleep, I wake up with prolonged severe headache and nausea. I have even waken up at 3 am due to this headache.