I have severe abdominal pain. It is high and center, under the indent of my ribs. I have little pain while sitting but a lot when I am standing or walking. I ve had the pains since Sunday. The first 4 days the pain bored through my abdomen and went up my back. I also has significant gas and bloating. Antacids did not do anything. It has been a little less the past two days but definitely still there. I went to an emergency room. A Chest CT, a chest X-ray, an abdominal ultrasound, and an EKG were done, but the nurse practitioner did not find anything wrong. Do you have any ideas?