What Causes Abdominal Pain With History Of Gallbladder Removal?

Hi, I have a constant dull sometimes sharp pain in my right abdomen. I had my gallbladder removed 10 years ago but it seems the pain is in that same area. It also goes around to my back. I asked my doctor, he sent me for a ultrasound, they didn t see everything due to gas but said it was normal. please advise. thank you, staci from sacramento