What Causes Chronic Stomach Pain?

hi, i have been what feels like being sick for almost a year now.. At first they thought is was just a typical stomach virus and gave me medicine and more medicine and still nothing..then it got worse when i would wake up and start gagging and throwing up that green nasty tasting stuff and it hurts like everyday on and off. some days it hurts more than other times. I had the procedure done to look and see inside and it had like a greenish tint color to it.. i dont see the dr til next wk about it. they havent said it was my gall bladder but kinda did. i have been losing weight. i used to weigh 145. now im about 130 . its difficult to eat as well. i forced myself to eat. And it just sucks it irritates me and my behavior as well. what do u think?