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The specialized things that you can consider can include various types of malabsporption syndromes which can be evaluated with a fecal fat test (looking for fat malabsorption) or a blood test looking for celiac disease. You can also consider Sphincter of Oddi dysfunction, which can cause gallbladder-like pain in those who have had their gallbladder removed. A Sphincter of Oddi manometry test can be considered to evaluate this.
Good Luck :)