You are right. It arrived today by over night mail.  I went and had my blood drawn today.  Now I am  getting nervous. The funny thing is I get this way until my face starts feeling full than I just want this this thing out.
Kara ~
I believe this is known as having conflicting emotions, such as being elated over, say, a job promotion but worrying that you may fail in the new position (
elation/despair).  As you stated, you worry about the surgery (
which is rational) but really want the tumor out (
equally rational).  The emotions conflict but eventually your determination to have the surgery will surmount your fears about it's possible negative ramifications.  
Make every attempt to focus on the positive (
no more AN) and although you're well aware of the risks, try not to allow yourself to dwell on them.  Remember, you'll have a lot of folks thinking of and praying for you and you're having your AN surgery in a facility with a sterling reputation among AN surgery patients.  I'm confident that you'll do well.  
Jim