Hello! I am 21 and have recently been experiencing episodes of tachycardia. Today was only the second time it has occured but its beginning to worry me. The first experience was during a game of follow the leader. I was doing some big jumps, only a few at a time so nothing that constitutes as cardio, and suddenly my heart began to race and my hearing was dampened. Felt a bit like a fight or flight response. I took a few deep breaths and in about 30 seconds i was alright. Two days later during a light workout i experienced the same 'fight or flight' feeling, my heart was beating so hard and fast it made my throat hurt and i had dampened hearing again. had to sit down and breathe and then went on about my business. I am in shape, eat reasonably healthy foods, teach at a fitness center, and this is the first time i have had any signs of a heart problem. The first experience i thought maybe i didn't have enough to eat and low blood sugar but the second encounter makes me think i should get it checked out. Any thoughts?