Hi, Jessica ~
I'm sorry to learn of your AN diagnosis and the episodes of acute dizziness you're experiencing.
My view is this: once your AN symptoms begin to negatively impact your quality of life - as yours are - it is time to end the 'watch-and-wait' phase and focus on treatment, be it surgery or radiation. Although AN removal surgery is a daunting thought, so is living in fear.
You are clearly confident of your doctor's skill and his prognosis seems quite positive. That being the case, my suggestion would be to go ahead and schedule the surgery before things get any worse. This kind of stress ('what if....?') is ultimately more debilitating than the surgery and if your symptoms are worsening, that may an indication that the tumor is growing and must be removed before you lose that 90% chance of hearing retention.
The decision is yours, alone, but in light of the symptoms you're presenting, I would plan on scheduling the surgery for the near future.
Please keep us updated, as your time permits. Thanks.
Jim