Hi - I underwent a total colectomy almost five years ago. However the cause was torrential diverticular bleeding. In response to another Medhelp patient's question, I described my experience on:-
http://www.medhelp.org/posts/show/523166
You may like to print this off and show it to your surgeon in order to check whether (broadly) it is what he/she would expect you to experience.
Please have a look at the posting and do feel free to revert (either via this forum or, if you wish, via the Medhelp email link)
Good luck
Morecambe