I am 15 years old and i've had this problem for about 5 years i would say. One day i was watching a movie laying on my left side for a good hour and a half. As soon as i got up, the pain was so unbarreable i almost started to cry. Its very sharp pains, which feels under my rib cage or in it, and when i try to breathe, it hurts it even more. It lasted for about 40 minutes and if i tried to breathe normal breathes it would hurt me too much. So i decresed the size of my breath my small and quick because that was the only way to get oxygen through my lungs without it hurting really bad. It would end when i could finally do that first big breathe. I havent gone to the docter about it because i've never slept on that side again so i didnt have to deal with that kindof pain again. The pain does come back for a couple seconds and then just stops, even if im just standing or sitting down. i really want to know whats wrong with me, if anyone knows what i have please reply back! thanks guys.
You really need to see a Dr...no way for anyone to know unless you get it checked. Any kind of prlonged pain is not something to ignore.