My father is suffering from epigastric pain after gallbladder laparoscopic surgery ?pain is sudden but very powerful. usg is normal .how to cure?

It is best to go back to the surgeon who did the procedure

He should be evaluated by his abdominal surgeon or a gastroenterologist. He could be experiencing a common bile duct stone, pancreatitis,gastritis or ulceration of the stomach or duodenum. Adhesions are less likely. Appropriate testing will be done in order to make a diagnosis and obtain proper treatment.