You should check your blood sugar routinely to monitor this. You might need to discuss a change in medication with your medical provider.
You could try changing your diet and/or trying over-the-counter H2 blockers like Pepcid or proton pump inhibitors like Prilosec. Serious conditions like an ulcer or even stomach or esophagus cancer can also cause similar symptoms, so you may need to see a doctor for testing. Gallstones can only be cured with surgery. Your doctor will refer you if testing shows that.