First off, stop doing all of the things you are doing that are exhibiting issues, you could be causing additional damage.

You had a tumour and everything else in your head gets pushed and pulled around. Take the time to heal by doing as little as you can and seek medical advice.

I'm sorry, that sounds really scary. You really need to talk to your doctors and maybe get a second opinion. We can't offer any medical advice or opinions because this sounds very specific to your situation. Take care.