Hi there,
Sorry to hear of your diagnosis but at least you know. I have colitis too and in a similar area. There is typical protocol for treatment that you will soon be learning about from your doctor. Your doctor may or may not also talk about diet and diet changes but these will also benefit you.
Pop on over to the ulcerative coliti board on this site and you will get a lot of support and great advice on treatment and diet etc. It is probably the most active forum on this site and there is a LOT of great info and friendly peeps
Good luck on your jourey of healing. It can be a stubborn condition but it can be overcome with a treatement and a few lifetsyle and dietary changes.