Just because you dont have stones on an ultrasound doesnt mean something else cant be wrong with your gallbladder. I'm going through the same thing with my gallbladder/pancreas right now. A hita scan is more definitive and checks the functioning level of the gallbladder which can reveal problems even without stones. I have the same problems with stress and I feel like its my main problem but its a double edged sword. I cant get rid of the stress because stress is causing the problems...ugh