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Cholestyramine is a "bile acid sequestrant" that decreases levels of bile acids in the intestine. There are some studies indicating that decreased levels of bile acids in the intestine near the stomach outflow can decrease movement of acid into the stomach itself and decrease incidence of stomach ulcers.
More commonly used medications for stomach ulcers and gastritis are proton pump inhibitors (omeprazole) and H2 blockers (famotidine), which decrease production or release of acid in the stomach itself.
You may benefit from adding tums or other symptomatic antacids into your regimen and considering testing for H pylori infection, which can make ulcers worse.
Ok. I think the most likely reason for the addition of cholestyramine is the reason discussed above, but it is also used for high cholesterol, so if your cholesterol levels were high that may have played a role in your doctor's decision.
Consider testing for H pylori and consider an endoscopy if your symptoms do not improve with medication.