I have throbbing pain in my sternum/diaphragm area. It lasts a few seconds and then stops, comes back a few minutes later. A day later it's still happening and now it hurts when I breathe in. Pressure in chest and upper abdomen, like a very full feeling after eating. Pepcid, ibuprofen, gas x do not help the pain or full feeling or pressure. This happens about every two or three months and lasts about a week.