I've been having pain that starts around my belly button and moves to right under my rib cage or to the right side of my abdomen. The pain comes and goes and gets worse after I eat. It's been going on for almost 2 weeks. I've also had a fever a couple times, lack of energy, loss of appetite, nausea, pain in the middle of my back and a little diarrhea. Could it be my gallbladder?