Gall stone pains

I recently had an attack of panreatitis. It can't be alchohol related as I really only have an occasional glass of wine high days and holidays and I usually fill the glass with water because I don't really like drinking. Recently about two months on I have been having serious pain in my back that radiates to the front around the base of my ribs and just above my naval. The pain is worse when I'm moving about, so much so that I find myself stopping and having to lean forward to ease it. Its like the pain gathers itself into a ball.I had an endoscopy where they found a small tear<5cms and a sliding haitus. Today I had an ultra sound scan and that has shown clear i.e. no stones. I am worried because if its not my gall bladder what is wrong with me?