KMA, the feeling you are experiencing sounds normal. Keep in mind, you have had brain surgery and lots of stuff is in your head and it needs to settle down and that takes time. Tightness, hearing issues, wierd sounds in your ears, tingling sensation in your face, strange taste buds, balance issues, fullness in your head, all of that seems to be par for the course. Rest, rest and rest. Your body will tell you when it is time to do more things. In the meantime, let your body recover. I learned from even the simpliest surgeries that your body still needs to recover. Walking is good when you are ready to do that. I started walking and that helped my body recover faster, in my opinion. However, I had someone walk with me for a few weeks until I was ready to exercise on my own. After about 3 months I was back to my normal exercise routine. Stay strong and REST!