I had active Crohn's for 7 years in my rectum and descending colon and tried every medicine available, so I understand what you're going through. I did not want to have surgery, but my colon was also in such bad shape that I had to do something.
I started out by getting a temporary ileostomy and kept the colon and rectum in. That was a good first step for me, since I could try it out, knowing that it was reversible. Well, much to my surprise, I really liked the freedom it gave me. I never had to run to the bathroom anymore, and I could finally sleep through the night.
Eight months later, I started bleeding from the rectum, so I had my colon and rectum removed. I was out of the hospital in four days, so it wasn't as bad as I thought it was going to be. It took about 9 months for the rectum wound finally closed up, but that was not a big deal.
Bottom line... I have no regrets. I am completely Crohn's-free and medicine-free and haven't felt this great in years. I wish I would have done it much sooner.
Good luck with your decision,