Hi Sue,
My dizzyness started a day after CK treatment. Got better after taking some Dexamethason, but for a long time I had sumptoms similair to what jtkate describes. It gets better so hang in there and keep up the walking. My guess is that the tumor is reacting to the radiation, becoming inflamed and swelling slightly, this puts more pressure on the balance nerve and your body just needs more time to allow the other side of your brain to take control. In time the tumor dies and you may get some shrinkage. All this takes time, different for each of us however. Ibuprofen helped me a lot when I felt weird. I try to stay active, walking the dogs, go shopping with the wife(not my favorite pastime), just to get out of the house. I think that really helps over the long term. I wish you well, you sound like one of the gang, Bob