hello sir, my father is suffering from severe stomach pain radiating to back,vomiting,discomfort in the stomach,fullness of stomach since a week. endoscopy was done which suggested iotiof gastritis with edema in stomach. then with antibiotics he was relieved,but now after few days it has occured again,what would be the cause.......some doctors said may be due to some obstruction in the veins in small intestine and have advised for ct angio