If you really do have a tumor, then use the excuse all you want... I won't argue.
i would ask a neuropsychologist that question. i don't know.
I was also having brain tumor, I suggest you to get operated as soon as possible.<br />
It is not important to know what it is affecting, more important is what it can affect(permanent damage) if kept untreated.
How are your emotions? Can you feel anything or are you numb?