hi, I'm 15 years old about 5'3 and 100 pounds, I'm not a person that has had any medical history. i am a dancer, I dance about 4 days a week 3-4 hours daily, and I've been expirencing severe chest pain, along with shortness of breath, the chest pain is usually a tightness or a feeling of someone stabbing me in the chest, and the breathing is a feeling of not getting enough air, I have went to a doctor about this issue, and not one has come to a conclusion about what it could be, possibly anxiety, but this has gotten to the point to where I feel like I can pass out, an not do anything sometimes, this has been going on for two years now, and it recently has started to worsen.