Hi thanks for asking question. You have not mentioned which gastric problem is present means diarrhea , constipation or abdomen pain. Mostly you will have stomach upset like simple gastritis or peptic ulcer. Take pentoprazole for few days. Drink more water. Cooked oatmeal useful in soothing stomach. Oregano oil capsule can be taken that is good herbal remedy. Avoid spicy food for few days. Avoid smoking if have habit. If you still have no benefit then ultrasound examination done to investigate further. If you have repeated diarrhea and constipation then irritable bowel syndrome suspected. Wish you good health.don t worry.avoid stress. Dr.parth