It's perfectly natural that you are getting emotional - you are having a major surgical procedure done. That's not to make you more nervous, just that your feelings are justified. Have you had psychological counseling? That's an important component to preparing for your procedure. Good luck, you'll be just fine!
My mother had the surgery done, and she can't drink too much liquid, otherwise it comes back up. I'm surprised you're able to do this without feeling abdominal pains.