I am 15 years of age, i am 156 cm tall and of 75 kg in weight. for the past week, i have been noticing fast heart beats and dizziness suddenly, even while i am seated. i read about palpitations, and i ve stopped drinking coca cola and caffine containing substances for about a week s time now. I was wondering, how long will the palpitations last, and is there any way i can stop it ?!