About gall stones

Hey everybody,
Here’s some old test results from 5 years ago when my belching
problems started.
Abdominal Sonography:
Gallbladder appears contracted with thickening of the wall. This
represents a pathological finding. No stones seen though.
Hepatobiliary Scan with Ejection Fraction:
Normal uptake of radiopharmaceutical within the gallbladder with
slighty delayed transit time into the bowel, which was seen at 70
minutes.
Ejection fraction calculated at 24.8%, which is abnormally low
considering normal ejection fraction is approximately 40% with the
half-and-half technique.
So, what the heck could be causing this in my gallbladder.. Tired of
belching up fatty foods, and all foods now really.

Any info, advice, expertise would be appreciated.
Thanks
Scott