I have gallstones, which cause the following complaints: bloating, constipation, pain under the right ribcage, stabbing pain in the shoulder blade, diarrhoea, light stools, etc., should I take GALLMET bile acid capsules?

Yes, because GALLMET tends to alleviate the symptoms listed in more than 90% of cases, depending on individual health and sensitivity.
You can also dissolve cholesterol stones smaller than 15 mm (about 80% of gallstones are cholesterol stones) by taking them every few months.

Please read the following articles:
How can gallbladder polyps and gallstones be treated with bile acids?
Gallstone removal, removal, types of gallbladder surgery