For the past 3 days I keep getting this really sharp pain under my left breast...it last like 1-3 seconds...and when it happens it feels like I cant even breathe or move until it goes away..almost feels like some bones are broken in there or some horrible muscle issues...but of course...im thinking it's my heart.

it has only happend once a day each time, and only lasted 1-3 seconds. What do you guys thing this is? I feel it right under my left breast and sometimes a but of it right behind like on my back where that pointy shoulder blade thingy iss...

is this my heart???? it's very very sharp.

i must add that it only happens when im sitting and leaning back or something...