perforated colon

I had a colonoscopy 5 months ago. My doctor told me their were no polyps , no diverticular disease and my colon was clean. He told me to come back and see him in 10 years.
I am a 69 year old white male. I have never smoked.
Three weeks I had emergency surgery for a perforated colon caused by diverticulitis. If I had no diverticular disease how did
I go from being free from diverticular disease to almost dying with diverticulitis?
Thank you for an answer!
Ken

[mammo]

I'm not making light of this, but it sounds like your had one of those med students that graduated at the bottom of his class.  I lost a son due to a bad GI doctor, so they're out there.  Plus, at your age you should have a colonscopy at least every 2 years, not 10.  I feel bad for you having to endure this dangerous situation.  I hope you find a new GI doctor, and kick this one to the curb!  Take care....