I'm a 15 year old girl, and for as long as I can remember, I've had this weird tick where I get a really bad headache. It starts at the back of my head, and pounds really hard. Then, I lose my vision, and see either blackness or a bunch of flashing colors. Sometimes my entire body goes numb, and sometimes my muscles will shake and tremble uncontrollably. Sometimes it's so bad, I subconsciously make myself sit/lie down. Sometimes I'll wake up from these episodes on the floor, with little memory of what happened. It's just so strange. For the past four days, I've gotten a pounding headache in the same place, the back of my head, whenever I look down or stare at something for too long. My parents say it's just migraines, but I've never heard of someone having violent tremors/numbness/passing out for a brief time over simple migraines. Has anyone experienced or seen something like this, and is there something I can do about it? Would a doctor be able to diagnose and prescribe something to help? Keep in mind that these episodes (as a child, I named them "Color-closing-ins, for the flashing colors) don't last very long, and the headaches they bring cease soon after my vision returns. Please help me; they're really annoying during school when I'm trying to pay attention. Heaven forbid I get one as a teacher is asking me a question, since I'll probably lose focus and not hear a word they say.
Thank you in advance ^.^