am 19 years old, as far as I know I am in perfectly good health. I m not overweight , I eat healthy. I dont excercise everyday but I get my fair share in. Last night at school I was sitting at my desk and suddenly my heart rate sped up at a very high rate. I felt dizzy and like I couldn t breath for a minute. I got up left the room and drank some water. I came back in and felt fine. Then shortly later I felt just a little light headed but nothing as severe as in the classroom. This was very scary to me. What do you think it could be? How to treat//prevent them? thanks a lot!