The list of diseases or conditions you gave like IBS, gastritis, obesity, underactive thyroid, hiatal hernia, indicates that you are experiencing gastrointestinal symptoms and difficulties such as belching or burping. A procedure like an upper GI may diagnose problems in the esophagus, stomach, or first part of the small intestine. As you probably know, hiatal hernia is a condition when the upper part of the stomach bulges through an opening in the diaphragm. It may or may not be shown with an upper GI procedure, but a symptom like acid reflux that you have when you miss the pill Aciphex, shows a probability of a hiatal hernia. Obesity is another factor that provokes the same symptoms. So, if you are overweight and can`t lose pounds with a healthy diet or exercise, surgery is an option to lose weight quickly. And if you lost weight probably the pressure on the diaphragm will be smaller, and the symptoms relieved.