anxiety?!?!

im 15 years old, and in the past 3-4 weeks ive noticed my heart beating extremly fast and about 3 weeks ago i collapesd while waiting in line, my heart was beating really fast then i just zoned out and woke up on the floor and not being able to hear much. i really worry beacese i could be compleatly relaxed and happy yet my heart would be beating heavily and really fast. i am really worried and this is really affecting my life negativly. i dont know what to do if someone could reccomend some  steps towards getting help id appreciate it... i  

[Naruto55]

you should go to ya doctor, and tell him whats been going on..cause even if its nothing big, it could help ease your mind

[allmymarbles]

I should think you have a physical problem, not a mental one. You need to see a doctor. You might just be anemic. That would account for heart rate, dizzyness, etc. Are you eating well? Eating enough meat? Taking vitamins?