Hi. Thanks for your query. Felt pain in stomach after eating- seems empty and hollow, rumbles some times. Seen a Doctor who gave Omeprazole, no result in 12 days. My thoughts: Since Omeprazole has not given any benefits, the problems is more than just acidity. I would advise you the following: X-ray of the abdomen in staning position. Ultrasonography. Tests of stool, blood and urine. Clinical evaluation by a General Surgeon. All these will point to a particular cause and the diagnosis will be made. If there is an infection, a course of an antibiotic and probiotic will solve your problem. If the cause is surgical you may need a surgical intervention.