I have had IBS symptoms since I was teenager, but never really diagnosed until a year ago. I have also been lactose intolerant since I was 16.I do find that this WOE helps, sometimes more than others. Unfortunately lettuce has always been a big trigger for me. I don't have any problems with cheese or sour cream or things like that. probably because they are not high in the milk sugar lactose as milk is. If I drink a glass of milk...watch out!
So maybe in moderation, you will not have the problems you think you might have with dairy products. I hope not because they sure add some flavour to this WOE. Although it seems many people blame cheese for their stalls...