Mangomonica, I can quite understand your fear with the thought of Crohn's as a possible diagnosis in the background. However, you have two CRS looking after you, and that is a step in the right direction.
Cherylk, one of our administrators, has Crohn's (she is not here that often) and she posted this link that may be useful should you get the diagnosis: http://www.Crohnsforum.com
Good luck with your surgery next week. We will be here for you.