You may have a stone stuck in the bile duct that was not found at time of gallbladder surgery.
Did they put a camera down your throat to check for a stone in the bile duct?
Are you eating a soft diet or did you go back to eating anything you want? Best to take it easy on food until your body has a chance to adjust to digesting food without the gallbladder. Digestion of fats will be difficult for a while.