I have the same pain in the center and sometimes to the left. My doctor thinks it is related to my GERD (gastroesophogial reflux disorder, pardon my spelling). I can pretty much keep it under control by eating 5-6 small meals/snacks per day and watching my intake of tomatoes, citrus fruits, and fatty foods. Mine usually comes in late afternoon or early evening, and rarely goes away before morning. Sometimes antacids and other rememdies work, sometimes they don't. One thing I am grateful for -- the pain subsides quite a bit when I am laying down. Does any of this sound familiar to you?