Radiologists generally aren't allowed to discuss what they see with patients. (Although I did once have the tech reading an EEG say to me, "I'm not supposed to say this, but - it looks fine.") You can ask, but consider how much you'll panic if he says "I can't discuss that with you." If you think there's a chance you'll assume something bad is there, don't ask.
I've had CT scans, though never on my head (for back problems and giant ovarian cysts). Really no big deal at all. The contrast isn't pleasant - not sure if you're getting that or not - but it's not awful, and the scan itself is no big deal. All you have to do is lie there, and unlike an MRI it's quiet and in an open *****.