Welcome to the club that nobody wants to be a member of.
It's highly unlikely that you'll recover any hearing after surgery or radiation (whichever you choose). It's extremely rare for that to happen although a couple of our members have had that experience.
I, on the other hand, have not. My diagnosis is almost the same as yours except that my tumor was only about half the size of yours when I was diagnosed and I had already lost 90% of my hearing in that ear and the remaining 10% went bye bye within the next few months.
It's possible, however, that you might get some relief from the tinnitus after treatment. I had mild tinnitus in the AN ear prior to Gamma Knife and that pretty much disappeared since then.