IBS or diverticulosis pain

Hello all,
A few years since my last posting but I do look in now and then. My problem is now as before recurrent abdominal pain across the lower abdomen, usually traveling from right to left side. In April I had an appendectomy because of this pain and for a few months all was ok or almost. But in the past few months it is back and bad as ever. Had a colonoscopy three weeks ago and diagnosis is the same as always, IBS and moderate to severe diverticular disease. And lately my BMs have been marble like whenever the pain is present. My GI doc really has no clear explanation or solution other than taking Bentyl and occasional stool softness. I can tell a few irritants in my diet, particularly salad, broccoli or sweet potatos. If anyone has any tips for handling this, I would really appreciate hearing them. Many thanks for this forum.