I really feel for you on the IBS. It's awful and annoying to work around as there is no one-fits-all solution.
I have found that certain foods can trigger my IBS- bread, pasta, rice, beans and cauliflower being the main culprits.
It's a shame you can't eat dairy as I have always found having a regular probiotic eases my bloating. Peppermint tea and pepper mint oil capsules have always been good to ease my symptoms.
Keep a food diary and keep your eye out on what triggers your IBS, without introducing too many factors at once. I found that some foods I can tolerate in small doses providing I don't combine them with any other trigger foods.
I'm following the Original plan, as I can reduce the number of triggers. Which plan are you following?
I hope you find a way around it that suits your individual requirements.