I m Patty, i m 17, turning 18 about 107 pounds and i have asthma and heart murmurs, though the cardiologist said 2 years ago my heart murmurs shouldn t disrupt me because it s not too serious. Just yesterday and up to today, i felt something on my chest. i felt pressure on my chest as i exhaled and it comes and goes. my dad thought i should sleep it off since i had a head ache, so i did. when i woke up this morning, everything was fine but around 2pm today, i started feeling it again. Is this serious? Do any of you know what it is?