So often times, if I’ve worked out for a while or if I’ve been laying down, or even if I haven’t eaten, then when I stand or sit up, my head starts to hurt, my vision clouds over and all I see is static like on a television screen, and if it’s really bad, I start having seizures. I went to the doctor and they said I shouldn’t worry, fainting like that is common and often dies down as you get older, but I’m already a teenager getting ready to graduate and I didn’t start having seizures until freshman year of high school. Does anyone else know what this is and what to do about it?