Time will help a lot. When I had my gallbladder out I had a lot of trouble with pain, cramps, and diarrhea - all the symptoms if IBS - just much worse.
Your body has to get used to a new way of digesting food without it's buddy, the gallbladder. It may take a few more days or weeks, but after it adjusts, you should be feeling much better.
Hang in there.
Pancolitis since May 2006
Have had IBS since childhood. (Maybe it was really UC)
Asacol, Atenolol, Zoloft, Hydrocodone
Acidophilus, Multiple Vitamin, Turmeric, Fish Oil