Sorry I forgot to answer your question - it's usually to the left of midline - same spot 99% of the time and just miserable. Constant feeling of someone trying to claw a hunk outta my scalp.
(One of my aura's is the one that makes my whole scalp tingle and feels like little bugs - that was scary the first few times considering I was living in a place that was high on the creepy crawlie scale!!!)