Probably a migraine. They can be pretty bad and can cause you to vomit. Caused by dehydration, lack of exercise, or excessive tv/Video Games.
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Sometimes this could be because of low blood pressure because I suffer from low blood pressure and I tend to feel like that sometimes.
There could be many reasons why your head hurts and you are dizzy. You could have a migraine or even an inner ear problem. Only a doctor can diagnose the problem.