Hi. Thanks for your query and an elucidate history. The most probable cause for your symptoms of pain in abdomen and chest on breathing can be related to structures near the diaphragm like :: Liver abscess Gall bladder inflammation Lower lung infection particularly with inflammation of the pleura. I would advise you the following: X-ray chest Ultrasonography of the abdomen Investigations of the blood and urine- particularly the liver function tests. Upper GI endoscopy as ulcer is suspected as per your history and you are under treatment for the same . The treatment will depend upon the findings of the investigations and physical examination by a Physician. Continue PPI , Antacid and the treatment you are already must be taking.