Joanna_an, hang in there. Mine was a single treatment so I can't speak to the experience of fractionated treatments, but I had a very rough couple of months starting about 2 months after treatment where my hearing, tinnitus and balance got worse and I was beginning to think I had made a mistake in my choice of treatment. Thankfully, around the 8 month point, symptoms got markedly better and am doing quite well now.
I agree with Jack in that the physical and emotional strain you are experiencing now coupled with your tumor basically being ticked off at what's happening to it are probably contributing to your symptoms.
Good luck and keep us posted.