Hiya, I'm a fifteen year old girl and I have recently been feeling extreme tummy pains. It usually doesn't last long, but occasionally I have to sit down holding my tummy, it happens a lot and it is spontaneous. as well to this, my tummy feels tight and my ribs feel this same sort of tightness? I don't know how to explain. I get heart pains occasionally too! sometimes it's pretty bad.. I exercise a lot, sometimes my heart gets bad after that. I've started getting head aches a lot, and now just lifting something up or walking down the stairs has got me tired and breathing heavy. oh, I'm also coughing a lot and I've lost my appetite sort of, like I don't eat as much as I used to, and if I eat to much I feel sick. and if I stan in one place to long or get up to fast I get dizzy.. I don't smoke and I haven't had sex!