What Does Pain Under The Ribcage On The Right Side Indicate?

Hi I m experiencing some odd symptoms. The other day I went to my doctor and told her that I have pain in my right side, under my ribs.. She reffered me for a sonogram. On the way to the sonogram later that day, the pain extended to my back right shoulder, plus feverish lain and chills. The sonogram results were clear and nothing wrong. The next day, still with pain, I saw my primary. She referred me to get a ct scan with contrast. I ve done that, this morning I got the results, and they showed nothing wrong. I went to my g.i. Dr, he gave me some gas pills to take and said if it still hurts in a week, I ll send you for a MRI. I m home now, and I have diarrhea, I think from the contrast, but also I just sneezed which left me with such an agonizing pain in my right abdomen. The initial pain I felt only happened the last 2 days, and would hurt more with movement, like if my ribs were to tighten up, whatever behind it was hurting. Now, when I sneezed or coughed, I get a burning pain that is so severe, closer to the middle, top right of my belly button. I don t know what to do anymore. I m in tears. And I am scared this could be something terrible, like appendicitis. None of the 3 doctors I saw have any idea.