Chest pain , chest discomfort or sensation like the food has been trapped behind the breast bone, and upper abdominal pain are symptoms of acid reflux.
If the pain is in the upper central portion of the abdomen, the "pit" of the stomach, you may have stomach inflammation or gastritis. Gastritis pain can occur in the left upper portion of the abdomen and in the back. The pain seems to travel from the belly to the back. The pain is typically vague, but can be a sharp pain.
If the medications don't work for the symptoms you have, visit your physician for other type of drugs.
Lifestyle changes are important, too.