Hi, I'm Roberta Hutchings, one of the moderators on the ANA site. I felt compelled to respond to your post.
Please have the MRI with contrast. A neurosurgeon with extensive AN experience will not do surgery without diagnosis without an MRI scan to confirm the tumor.
I'm close to your age, 16 years out from retrosigmoid surgery to remove a 3.5 cm. acoustic neuroma. My hearing was gone years before my diagnosis, but symptoms were exhaustion, tinnitus, facial numbness, dizziness and balance problems. Those are typical symptoms of acoustic neuroma, some of which you are evincing.
Please ask your doctor how much experience they have with acoustic neuromas. If he/she is only doing the surgery occasionally, please another neurosurgeon who's experienced with them. There are several centers around the country who specialize in treating them.
Like I said, please get the MRI done asap. At that point you'll know exactly what you're dealing with, and can make a plan for moving forward.
If you'd like to talk, my number is 720-225-7421.
Bert