Well come to HCM Thank for asking Your concern being appreciated, your mother is given correct medicine but it is not being in right dose, Omeprazole 40 mg should be given with Tab Domperidone 10 mg once in day, at evening time and it need to be taken for five weeks, it is most important to avoid the heavy meal, spicy food, oily fried food, fat contained food, coffee, prior to bed, she has to remains stress free too, all of these treatment and medicine will give best result, avoid aerated drink too, alkali food and drink would much helpful, like vegetable soup, and vegetable salad hope this information helps.