Hi thanks for contacting HCM.. Stomach pain could be from infection or from ulcer also .... So your daughter given antibiotic course . Along with that omeprazole capsule also taken for two weeks ... Avoid gastric irritants like .... -smoking -stress -excess tea and coffe -alcohol -excess spicy foods etc...... If still no improvement investigate with urea breath test for H.pylori infection induce gastritis .... If still cause not clear than endoscopy like higher investigation has to be done for more work up. Consult gastroenterologist with keeping this in mind . Take care ....