Wolfpat,
I had a few rounds of diverticulitis 15 or so years ago. Then instead of the diet they recommended, I went to a high fiber diet complete with seeds and nuts. At my last colonoscopy, almost all the diverticula were gone! Smoothed out and gone.
Good luck to you.
My work partner had a bout with diverticulitis last year. They took half his large colon out. He was told to lay off anything seedy or nutty. But he has increased his intake of high fiber foods.