Hi Marsye,
Two years ago I was given a colonoscopy... and it was discovered that I have diverticulitis. I always thought it was just IBS. Apparently you can suffer from both (as I do). I really can't say what helps and what doesn't. Sometimes things irritate and sometimes they don't. Eating fibre is food for Div. but not so helpful for IBS as it can cause bloating. Just tell your poor DH I am sorry he is suffering from this, keep trying different things to see what works for him... and tell him I am sending a great big hug from across the pond!
Hugs
Caroline