I m a 13 year old boy. I did gymnastics for 8 years but stopped last summer and I m not that active anymore. I go to the gym about once or twice a week. Normally, I play on my laptop for a long time, sometimes 4-7 hours a day. :/. Sometimes, I get really bad chest pains in my heart. Tonight, I experienced the worst chest pain I ve had ever. It stung really badly and it felt as if something was stuck in my chest for a second. Also, last week when I was running with my friends, I experienced an awful chest pain where I doubled over and couldn t breathe. What should I do?