Hi Mary,
Dang! These ANs are sneaky little things, and can snatch away hearing in a matter of months. Given how fast yours has been declining, it is likely that even with earlier radiation treatment, you would still have lost it. Radiation doesn't take effect immediately, or slam on the brakes, and for several months after, whatever damage was occurring can continue to occur. I was informed about this regarding my own hearing, which might well have gone entirely after treatment - and may yet do so in the future. My hearing is closer to 50%, and though I get some distortion with a hearing aid, it is still serviceable and helpful. I'm lucky for now, I guess. You can still do CK or GK; with CK, they may want to do a single dose, like they do with GK, since the hearing is moot now - or is that mute?
On the bright side, you may have a BAHA in your future. By the time you need it, Jan and Lori and I will have converted Lori's garage into a BAHA accessory kit assembly shop. They are going to be the next Internet shopping hit. You get cake string, and Dawn dishwashing liquid, and a torque wrench, and all sorts of goodies. Having a snap on post mounted in your head is the coolest thing. If I go deaf in my left ear, I will be signing up for one straight away. I am already practicing the phrase "Excuse me, let me snap this device to my head first, then could you repeat that?" I can hardly wait...
When I was down at Stanford, I met a woman who has been deaf in one ear for 15 years now - a sudden overnight deafness, attributed vaguely to a viral infection, since no specific cause was ever found. She does just fine, and functions quite normally. Of course she misses stereo hearing, but it seemed like more of an inconvenience than anything else for her.
Oh well,
Steve