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?