What Causes Indigestion, Gases And Abdominal Bloating?

Hello I was told by my doctor after several tests that I am not digesting my food. It seems it is getting worse and my stomach is bloated Ihave had two colonoscophies, ct scan and ate the light I have a lot of gas and acid and very uncomfortable I am on omeprazole and ranidine could it be my gall bladder It does not show anything on the ct scan I also had a nuclear test and was told it was ok I was told it was white in some areas