I think I'm having heart attack???

Its hard to make sense of this question. From what I understand you are 19 and have been to the ER 50 times over the last 8 months thinking you're having a heart attack? Do you even know what a heart attack is? I've been answering questions about heart disease here for months now and I'm starting to get discouraged because every time I get on here its teenagers thinking they are having heart attacks. It sounds like you will not be satisfied until someone tells you you are having a heart attack. It does happen that teenagers have heart attacks, but this is very, very rare in someone so you and is usually caused by cocaine use in those rare cases. Your body hasn't been arouind long enough to accumulate much plaques in the arteries feeding your heart. It sounds like what you have is out of control, poorly focused anxiety that needs a focus, so you have chosen your heart. You need mental health treatment, is what it sounds like. The emergency room staff can refer you for the help you need, and would probably be happy anhd relieved to do so.