WHY??

I posted a similar thread in teen health as well, but have been redirected here. Well, Im only 14 and sometimes, very rarely black out for no reason. One minute I will be on the computer plaing a game, then I will just like wake up or something and be doing something completely different. It hasnt hapened in a few days, but had a few bad ones last week. My mom is calling my cardioligist.
I also have a small heart disorder nothing much. Also, I get about 9 and a half hours of sleep a night, and seem to still be very tired during school. I have to take caffeine pills sometimes to keep me awake. This is really buggin me and would like an answer.