Oddly enough, some patients with gall bladder disease have no symptoms at all, and their disease is caught during another medical examine.
Your gall bladder has an ejection rate of 0%. This means that it is not sending any bile into your digestive system. An ejection rate of 0 is a strong indicator of gall bladder disease.
Nausea is a very common symptom. The pain that you describe (in the back - I'm guessing the shoulder blade area - and the front - I'm guessing right below your right ribcage) is also consistent. The pain and nausea typically come after eating a fatty meal. However, since your ejection rate is 0, I wouldn't be surprised if your body just constantly went through cycles of pain/nausea.
Also, with an ejection rate of 0, I'm surprised that the doctors didn't recommend immediate surgery.
If you start to develop a fever, or vomit, or have dark-colored stools (the color of road tar or coffee grounds), get to an ER immediately.