Very sorry to learn of your decline in hearing. I had CK, so my situation is somewhat different. Had moderate hearing loss pre-CK, and maintained that for about 6 months. However, neuro-otologist wasn't too hopeful - he said that lots of people retain their hearing in the short run with ANs that are treated with radiation, but lots of people lose more hearing in the long run. Don't know how it plays out with surgery in the long run, but I think what the doctor was getting at is that treatment can damage those nerves and it can take awhile for them to gradually lose function.
Well, he was right, unfortunately. I've also experienced a decline in my hearing and was treated around Thanksgiving with steroids (60 mg. prednisone taper for several days). I don't think that was really strong enough, and I don't think I've really regained any hearing. I'm a person who's had some really negative reactions to steroids, which are hard to get over, each time I take them. I've accepted the fact that I may well lose much of my hearing in that ear over time. At my 6 month followup with my neurosurgeon, he said he wouldn't give steroids much of a chance of improving hearing in my case, anyhow.
Fortunately, I got a hearing aid right away, even before I found out about the AN. I'm resolved to keep using technology to assist me as much as possible. If you don't have a hearing aid yet, you might consider getting one. I've found it extremely useful, although it takes a while to adjust. My thoughts and prayers are with you, keep us posted!