Can i continue with amaryl 2 mg and discontinue janumet (sitagliptin and metformin) as it gives me stomach discomfort?

Talk to your doctor: Tell your doctor about the stomach discomfort so that he/she can evaluate and prescribe a different regimen. You might want to break the janumet into januvia (sitagliptin) and metformin and eliminate one drug at a time to see which one is causing the discomfort. In any case. Don't stop meds without letting your doctor know about it.