I have been having pain under right rib cage with what I call muscle spasm feeling also. I also have had a couple of very trying episodes of heartburn . I feel like I am constantly belching lately. I had a gallbladder sonar today and it showed sludge and thickened walls of the gallbladder. What real significance is this? I am scheduled to have a hida scan on monday. I have had these symptoms for sometime now and just blew it off as gas but it is coming frquently now. Any answers would be appreciated!!