I had five sessions of Cyber Knife in April 2018 and had similar symptoms. I was tired for at least a few months, taking naps during the day and just falling asleep on the couch. That finally went away, and what I found is to listen to your body. When you need rest, that is what you should do. I had dizziness and still do after six months. The headaches come and go, especially if I get a bad sleep.
My doctors said that the tumor can swell anywhere from 6 months to 1 1/2 years, so no telling when it will occur. My tumor is impacting my facial nerve and I assume as it swells, my face may become more numb. Once the tumor begins to die and shrinks, some of these symptoms should decrease or completely go away. I am hopeful that is the case.
There are several of us that had radiosurgery this year and we are all going through various issues. Let us know how you are doing as the days and weeks go on. Be well.