Welcome to HCM,
It seems that you have got primary cancer in your kidney
and now there is metastasis in your brain.
From primary focus cancer cells travels in various parts or organs of the body and there is deposition of cancer cells producing another tumor
, this is called ,metastatic tumor.
In your case this tumor in the brain presses upon brain tissues causing pressure symptoms.
Problems you are having are due these pressure in brain tissues.
Consult cancer surgeon and he will start radiation
therapy and chemotherapy
Ok and bye.