Hi Vonda,
I thought I would comment to your balance questions. It is a little hard to predict how your vestibular system will react after surgery in regards to recovering completely back to normal (pre-AN) state. Some have reported that treatment improved their balance. Your brain is plastic enough to relearn balance after losing vestibular input from one side. And from what I've experienced and read about, the relearning happens more successfully after losing vestibular function on one side completely (from surgery), rather than vestibular function that may be intermittently affected by the AN (pre-surgery). Ask your doctors about your balance issues, they're the experts. Many people also attend some Physical Therapy for Vestibular Retraining, which can help speed along the relearning process.
Since you have been experiencing some balance issues, your brain may already be compensating and relearning. So you may have less balance issues post surgery compared to someone who has had no balance issues pre-surgery. This is good. Since AN is often growing on the vestibular branch of the 8th cranial nerve, the vestibular nerve is often cut during surgery. For someone who has had no balance issues pre-surgery, and the brain hasn't had a chance to compensate, this means that the brain is going to receive confusing vestibular input immediately post surgery. Because of this, it's not uncommon for AN patients to experience dizziness immediately post surgery. And it can take days to weeks to relearn balance enough to walk unaided. Hopefully for you this won't take as long, since your brain is probably already relearning balance.
Hopefully you'll be able to continue your horseback riding. I continue to play basketball after AN surgery. I can't tell you that it is completely the same as pre-AN. My "balance reserve", how quickly I can move without losing orientation, is perhaps somewhat reduced. But I still enjoy being out on the basketball court and competing, and no one else seems to notice any difference. Other AN patients I've talked to still run, ride bicycles, etc.
Good luck with your AN treatments. We'll be thinking about you.
Regards,
Rob