Strange heart episodes?!

Ok for a couple of years now i've gotten really strange feelings in my chest!. Sometimes I feel a fludder and other times i feel a slow pounding sensation!. The worst part is is that it sometimes feels like I got my breath sucked right out of me!. I even almost passed out in class!. I've been to doctors and they don't give me any answers!. They told me to not consume caffiene and to avoid allergy medicines but the feelings in my chest persist!. I don't know what else to do i know there is something wrong but no one believes me!. Can someone help me!?Www@Answer-Health@Com

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