Do you thing the radiation I got from head CT scan 3 years ago gave me a brain tumor-im asking because im having a brain tumor symptoms now so worry?

And why the Head CT. 3 years ago? The chance of a head ct causing a brain tumor is extraordinarily low for an individual probably less than 1/10, 000 studies. See a neurologist or get an excellent history and exam before any further studies.
Not likely. The amount of radiation from a ct scan is highly unlikely to induce a brain tumor. Also, "brain tumor symptoms" can be from many things other than a brain tumor...Unless you have a ct scan or MRI scan, or a brain biopsy which shows that indeed you have a tumor, then you may have many other possible conditions other than brain tumor. Consult your physicians and find out what's going on.