Luckyone:
My experience post-CyberKnife (CK) treatments is much like PaulW's: since treatment, my balance has improved about 80% and my tinnitus is about 90% lower in volume (on most days, not always). Statistically, it is rare that tinnitus improves after radiotherapy; Paul and I got lucky. Dr. Steven Chang (esteemed CK specialist and neurosurgeon at Stanford Univ Medical Center) told me that about 25% of CK patients see an improvement in their balance at some point after treatment (it might take several months before that happens). My energy level has rebounded pretty dramatically, too, since treatment.
The reason why Ned's balance improves with faster walking, I believe, is because it stimulates his balance system more. The more active you are, the more your brain compensates for imbalance caused by your damaged vestibular system.
As others have said, you will come to grips with this brain tumor soon. Two weeks after I was diagnosed, I was still a train wreck; I literally thought my life was over. Now, life is great. It takes time, but you'll get there, too.
While it's a bummer -- and unfair -- that your wife is being so needy and, dare I say it, disloyal right now when you need her support the most, that will also work itself out in the long run. There are many positive lessons that come along with the misery of having an AN. One of those lessons is it tests your closest relationships. You find out who your real friends are. The best relationships grow stronger, and the weak ones become obvious. What you do about it is up to you, of course, but it's all part of your journey toward living a happier life. Please forgive me if that sounds really patronizing. But I think a year or two from now you'll see the positive side of all this and where it has led you to. That won't change the fact that having an AN is not what you would have chosen, and it will still suck. But the proverbial lemonade is being made right now from the lemons you've been handed.
You will feel better soon, I promise.
Best wishes,
TW