Since you have completed your 15-day course, you should stop taking the combination treatment kit. This kit contains antibiotics, which should not be continued beyond the prescribed period to prevent side effects and drug resistance. Depending on your recovery, your doctor might advise you to continue taking just the acid-reducing medication (a proton pump inhibitor) for a few more weeks to help your stomach lining heal completely. Please consult your doctor for your next steps. They will likely schedule a follow-up test (such as a breath or stool test) in about four weeks to confirm that the infection is fully cleared.