Hi, Don't worry, the surgeons know what they are doing. I don't know where you are in the world, but, if like me, you are in the UK, then the NHS is fantastic. If you are attending St. Marks in Harrow, so much the better.
I had a very similar op 38 years ago, I have had Crohn's for 55 years, and this was my first, and last surgery, and I was so much better after the disease was removed.
Pain is transitory, and will soon go, and you should be out of bed within 48 hours, I was, and I was discharged about a month after the op, mainly as I was on TPN, and needed to be more than the 6 stone I was.
Try finding the IBD nurse at your hospital, they definitely DO know everything, and will talk to you and allay all your doubts and fears.
You are probably feeling grim from the Crohn's at the present, but after surgery you will feel 1,000% better, and should be able to do anything you wish.