Hi. Thanks for your query. Noted the history and understood your concerns. Getting a big and tight stomach after food indicates some sort of intestinal obstruction in the duodenum or jejunal part of the small intestine. There can be constipation due to improper food intake due to the problem that you have. Pan 40 alone may not be helpful as it does not help for bloating and such symptoms, it helps only for controlling acidity in stomach and avoid the side effects. I would advise you the following in such a situation: You have to consult a Doctor for getting a proper clinical evaluation and further investigations like Barium swallow and meal to see if there is any obstruction as discussed above. An Upper GI Endoscopy helps further to get the exact cause. Other investigation of blood and stool helps further . Once a proper diagnosis is done the further course of a surgery and/or long term medications would solve your problems.