I too have diverticulosis, had it for years. But so far, touch wood, I've never had an episode of diverticulitis. It is a pain in the neck, though, because waste matter can get trapped in the diverticula and it will suddenly be released into the colon proper with little warning. And that's when I need to get to a loo very, very quickly!
I do really strongly advise you to see your GP and get it properly diagnosed. If you do indeed have diverticulitis (rather than diverticulosis) then it is infected and needs attention.