Hi im 16 years old, female im 5'7 and i weigh 145 pounds, im very athletic and work out alot at the gym, i am very big into fitness and am vegetarian. My diet is healthy and consists mainly of fruit and vegetables. For the past two weeks or so, i have been getting a very fast heart beat , and dizzy. Today it has gotten slightly worse and my heart rate was very fast (about 3 beats per second) i had trouble breathing and had sharp pains in my body causing me to jerk a little, this lasted for 30 minutes and has calmed down now a little, i was just wondering if you might know what is causing this or what i can do to try stop this?