Hevreh, what you are going through is normal. Getting better is simply a waiting game: it will happen but takes time. In my case, I had profound fatigue for 2 months following CK. My balance was 15 to 20% worse for six months after getting CK. Then at the six-month mark, my energy suddenly picked up and my balance improved dramatically (to where it is now better than it has been in over 9 years).
Everyone is different but I expect that you'll be feeling great 6 to 12 months after treatment, as that seems to be the norm for people who initially have a rough time post-CK. While that may seem like a long time, it'll arrive before you know it. And one more thing: you might be feeling so bad now because your tumor is reacting strongly to the radiation -- a good thing! I had initial swelling (with attendant fatigue and dizziness) but also unusually pervasive necrosis (tumor tissue death) at 5 months post-CK. Six months later, my tumor shrunk dramatically. So my point is that your tumor might be on the "accelerated reaction and recovery plan."
Hang in there. It will get better soon.
Best wishes,
TW