Jaqui,
I was in your same situation one year ago, and yes, the balance does get much better. I was having severe balance problems leading up to my surgery date including even falling into and through a plate glass bookcase while taking off my pants one night!!! I was fine, but the bookcase didn't fare so well! You should see an immediate improvement right after the operation. The balance will not be perfect, just better. As time goes on with your post op recovery, you should see gradual improvement over the following months. I did notice big improvements at 6-8 weeks and even more improvement 8 months later. So patience will be your virtue in dealing with the extended recovery. The only thing that will not come back is balance in the dark or with your eyes closed. Since you will only have one good nerve left, the brain relies more on your vision and that one nerve to reprogram your balance. Otherwise, you will be glad to see the improvement in the coming months. Your sporty background will help ALOT in your recovery, and as someone said, your brain is already compensating before the operation. So you may find a more immediate recovery than others.
Good luck and keep us updated.
Regards,
Steve