On another note, would a few people who have had their AN treated by radiation chime in about their immediate (and not so immediate) side effects? I'm very curious about your experiences.
Someone recently PM'd me the same question, so I'll just paste part of my reply here (while being careful to protect their identity):
Immediately after getting CK, my balance symptoms got about 15 to 20% worse. This lasted for about six months. Then, very quickly, my balance started to improve. It is actually much better now than it was before getting CK, in fact better than it has been in around 10 years, although I still have mild disequilibrium. It's pretty unusual, from what I understand, to actually have balance improve compared to pre-treatment function. You're more likely to have your balance symptoms worsen a bit after treatment, but then have it return to pre-treatment level of symptoms several months after treatment. I've been lucky. My tinnitus also dramatically improved immediately after getting CK, which is an even more unusual outcome.
Unfortunately, I had an episode where I had hyperacusis and lost about 10 dB of midrange hearing on my AN side about 4-1/2 months after treatment. The hyperacusis went away in about a week or so (I think taking large doses of natural vitamin E helped), but the hearing loss didn't reverse. Later on, during months 6-12, I lost another 10 dB of hearing in my midrange frequencies on my AN side, but my hearing rebounded in the bass frequencies by about 10-15 dB.
One other thing: I suffered very severe exhaustion for a couple months after getting CK. This was unusual, as most people have only mild to somewhat pronounced fatigue for a couple weeks, and some people don't feel fatigued at all after treatment. Because I have had very dramatic tumor necrosis followed by shrinking, I believe my intense reaction (fatigue) was due to the tumor reacting very strongly and quickly to the treatment. That was a really good thing in the long run but was difficult to take in the short term.
I am totally, 100% happy that I had CK. Doctors said I would surely have been deaf [on my AN side] following surgical resection; instead, most of my hearing is preserved. My balance is dramatically improved and my tinnitus greatly reduced. CK has been a lifesaver for me.