Last year, as a senior in highschool and a Freshman in college, I blacked out twice within 6 months of eachother. The first time i was sitting in my first period class and got blue fuzzy lines and blacked out. when i woke up i was vomiting on myself and convulsing. No drugs/alcohol, not pregnant and was not over constipated. I had a full CBC and they said nothing. The second time i was in a CVS and was waiting to fill sinus infection medication, when i remember getting REALLY hot in the face and hitting the floor. That time i got an EKG, Cat Scan, CBC and pretty much anything else they could think of. Now, a year later, ive been feeling heart palpatations, to the point sometimes my heart is jumping out of my chest, MASSIVE migraines usually the Left side, i see a dark spot in the left eye, when i stand up i get IMMENSE pressure in the lower back portion of my head, where i want to pull my shoulders up, sometimes my vision gets blurry or starts to go black. The docotr is sending me to see an endcrinologist because my sister has thyroid cancer. I;m just lost and in alot of pain. Im a full time Biology major and my life is spent reading and most days i can't even do that.