Hello Doctor, I am 16 years old female, non-smoker, no heart diseases (I guess) well, months ago I start having these hard, heavy and strong heart beats, I think it just last for 2 seconds and max 5 secs, and I don t get these daily, I m not sure about the time between everyone I get but what i m sure about is that they hit me just like that (randomly), and when its get started, i feel like my breath get stronger, like i breathe hard -not very hard, i can breathe but its get harder than before.. And i can feel those heavy beats clearly.. And the other issue, i don t know if the other one this one are connected, but when I stand up after lying down or sitting on a chair for a while, i have to hold to something because i feel dizzy or i have no balance or something, also, i see stronge light everywhere, i ll not say stars, because i don t think they are but it is something like light, and when this thing happens i can t see things infront of me clearly, i see those lights, i don t know maybe they are stars or spots, i m not sure, and sometimes i have to hold to something and bend over to feel better. these lights and dizziness doesn t last too long, lasts for seconds, 10 secs maybe... the heavy heart beats doesn t happen to me before or after standing up and seeing the light, they happen to me in saperate times. and in the end, i want to thank you for reading my email/letter, and i would appreciate it if you e-mail me back, looking forward to hear from you.. GoodBye! sign, Fatima