chatkat,
I'm so sorry you're having problems with Crohn's and Diverticulitis. Unfortunately, you can have both at the same time, and many people have surgery for both.
I had Crohn's in my large intestine and rectum for 7 years and had surgery two years ago. I know it's a scary thing to consider, but I have to tell you, I have felt fantastic since being rid of my diseased colon. I also don't have to take any medicine anymore, which is wonderful, too.
I'm glad you found this forum. I didn't have any "ostomates" to talk to before having surgery, so I was completely in the dark. I would have done it years sooner had I known life with an ostomy would be this good. Please ask us any questions you have, and we'll do our best to answer.
Take care,
Cecilia