@bkatz43 You probably have had for a while. I remember my first really bad episode and my Dr. said it will keep happening and getting worse with every episode. Did they see it on the CT scan in ER?
Have you had your colonoscopy?
I tried everything diet and sometimes that does not work. It the pocket gets food stuck in it will always go to an infection.
You must drink a lot with every meal and try not to overeat.

@bkatz43 I suffered from repeated flare ups resulting in multiple ER visits and then antibiotics that made me sick. I tried various diets but the flare ups continued. My GI finally referred me to a colorectal surgeon. She highly recommended I have that part of my colon removed for fear of a rupture.
I decided to go ahead with the surgery because I couldn’t deal with the fear of continuing diverticulitis or a perforated colon and emergency surgery.
My surgery was in January of this year. I am 72 years old. They were able to do a robotic resection and I haven’t had a flare up since then. I’m very glad I opted for surgery.
I do suffer with chronic diarrhea and stomach upset which I’m seeing my GI about. I don’t believe all of it is surgery related although the diarrhea could be. I’m having an endoscopy later this week to see if something else is going on.
All that being said, I am very grateful I opted for the surgery. Those diverticulitis flare ups are awful.
Good luck to you.