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Usually pain from gall bladder is felt on right side below the rib margin.
But in a small percentage of cases, the site may not be typical.
As reflux medicines are not helping & you have got antibiotics for SIBO, so doctor is evaluating the other possibilities.
If you had EKG, echo after start of the pain then it is unlikely to be related to heart.
Sometimes, costochondritis of ribs can also cause pain there.
Repeat tests for H pylori can be taken, if you did not have it recently.
Simple non invasive tests from blood, breath or stool can be considered.
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