yeah i seriously doubt u got coronary artery disease my grandpa had that and he was 84 when he had quadruple bypass surgery. thats from a life of eating all types of food cuz back in the day people didnt know about fat causing cholesterol buildup and all that. its most likely paranoia like friendowl said. the more you think about it the more you r gonna freak out. u can cause your heart to start beating fast when u think somethin is wrong like that. sounds like u just got stress in your chest.