My abdomen and lower rib cage feel bruised like I fell on my abdomen. There is a constant pressure feeling on my right lower rib cage up front and in back and i'll get this really painful sharp stabbing pain in my right shoulder every once in a while. The pain in my ribs is constant though. My bowel movements are inconsistent going from loose to hard all the time. I don't eat nearly as much as I used to and have lost 10 pounds in three months. I feel full after only eating a little bit. It also hurts my abdomen when someone hugs me from behind. Any ideas?