I guess I would agree with Deb, taking a good look at CK would make sense. There are some who have had the 4-6 week series with Novalis with good results, so it is not a bad choice. But there does seem to be a growing consensus that CK is the best of the bunch - it is accurate, minimizing exposure of adjacent tissue, and can be broken up into 3 to 5 treatments, avoiding the big blast effect. Facial nerve problems seem to be rare, in the 1-2% range.
A simple step would be to post a question on the cyberknife forum, and see what the CK doctors have to say. They will favor CK, of course, but there reasons might be helpful for you in deciding whether to stick with Novalis or seek out CK somewhere. I don't know if the size of your AN would be an issue, but the doctors on the site could answer that. The site is
http://www.cyberknifesupport.org/forum/You can quickly register and post a question, and see what kind of response you get. It couldn't hurt.
Either way, I wish you the best with the rest of your treatment.
Steve