The hida scan does not test for inflammation, and an ultrasound cannot pick up inflammation. Their is not really anyway to tell if it is inflammed unless your white blood cell count goes up really high from fighting the inflammation. When they remove the gallbladder they can see past times that it has been inflamed.
Their are many homeopathic type remedies that people believe in for helping the gall bladder function better.
I would just think with a hida scan that low that you would be having alot of discomfort, pain, nausea, vomiting and/or diarrhea. I'm not sure what the percentage is for that test to be wrong, but i'm sure their's room for error on it. The bloated feeling is probably a sypmtom of your gallbadder not functioning right.
I would look up some vitamin/homeopathic type drugs that are otc and try to find them at a local viatmin shop & see if this helps with your bloating.
With changing your diet many people can keep their gallbladder for many more years. It just depends on how bad your symptoms are.
Good luck,
krystle