Hi. Thanks for your query and an elucidate history. The pain in abdomen all of a sudden which is relieved by vomiting can be due to the following reasons: -Gastritis with outlet obstruction at the opening into the small intestine due to ulcer at the pylorus -Small intestinal obstruction when the vomit is all yellow and bile. I would advise you the following: Get an examination done by a Surgeon as physical examination reveals may diseases better than any tests known. Upper Gi Endoscopy barium studies if the obstruction is expected to be in the small intestine as the endoscope reaches only the first part of the duodenum. Get started on Domperidone and Ranitidine. Take antacid get. Soft bland diet IF no relief , further investigations as already advised.