janitorx:
Hi...and please don't panic.  You are not 'screwed' at all.
Just last year, I had a 4.5 cm AN tumor de-bulked (hollowed out) via (retrosigmoid) surgery and then radiated by Fractionated Stereotactic Radiosurgery.  I suffered absolutely no facial paralysis.  My surgeon employed nerve monitoring and the FSR treatments were highly detailed and plotted to avoid the facial nerves.  It worked.  My pre-op symptoms practically disappeared and now, nine months later, I'm pretty much the same as ever and no one would know I ever had this condition.  Yes, I had some medical bills but they will accept monthly payments if you ask and don't renege on the agreement.  Remember, you have a benign tumor - not cancerous - and it's treatable.  You could easily have a very good outcome from surgery.  Do the research, have more than one consultation with a neurosurgeon and choose your surgeon carefully, asking the 'right' questions, as I trust you will.
This website - beyond the forums - is a fount of information.  I suggest you peruse it.  Knowledge really is power, in this case.
Best wishes as you continue on your personal 'AN journey' - from those of us who have been there.  
 Jim
Jim