I ve been having abdomal pressure under my right rib cage for 3 weeks now. I had an ultra sound today to see if my gallbladder looked okay and it did. My doctor wanted me to try Nexium for 10 days and see if it would help and nothing has changed. Any idea what the pressure i m feeling is? Also have had diarriha for the past 24 hours. I m not sure if this is due to the pressure or not. Please help! I m a 32 year old female, and am very worried about my health.