I have not done a Liver Flush after gall bladder removal, but I have instuctions for one that is specifically for removal of stones. It softens the stones, then you expell them. It's not too awful hard to do either, just one wicked drink at the end. I've done it a few times, and seen the gall stones come out in the toilet (sorry too much info maybe :)) .
If you do have IBS, I would definately recommend kefir over yogurt. Google it, you should get some anyway, everyone should.