Severe headaches

Dear Ask The Doctor: I've been getting severe headaches for about 5 years now. the pain starts in the middle of inside the head and pushes outward (the pressure feels like my head is going to explode) afterwards i get really nacious and start vomitting, and then i get really weak and tired. this process usually last 12-24hrs. i've had normal headaches and migraines before and i know this is something different. light and noise do not effect the severeness of my headaches. i've tried many medications (perscriptions and over the counter pain killers) and nothing works. what could this be?

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