I'm 17 and my heartbeat is really irregular, like it skips around constantly. I'm not entirely sure if anything is actually wrong, because anytime I've gone to see a doctor, they don't notice anything wrong. Also, every once in a while my heart starts pounding in my chest, so I can't breathe very well and I sometimes get dizzy. It's also sort of painful, like something is pressing down on my chest. I've read about heart arrhythmia, but I don't know if that's what it is because that's been explained to me as a sort of heart attack. I'm 5'7" and I weigh 120lbs, and I exercise fairly often, so I don't think I could have a heart attack. Help the idiot girl please? (I didn't know what topic to list this under. I've been trying to find answers before seeing a doctor and this seemed like a logical place to look...)