last night and during the night my left side was sore. I didn't think much of it until I woke up at 5 and it feels like someone is stabbing me under my the lower part of my left rib cage. it's a very sharp pain, and is causing me to not be able to move. I have been experiencing pain like this, sparatically, for about 5 years, I am 16 now, and as time goes on the pain just gets worse. what could this be, and what should I do?