The first? I don't think this sounds right....
Not very dramatic...
Good for falling over a precipice and screaming all the way to the bottom.Suggestion: Aiiiiiiiiiiieeeeeeeeeeeeeeeeeee!
I agree with what you say. I would personally "bang" my head, and I think that is the more common way to express it in my area of the USA."Stub," usually referring to running into (colliding with) an inanimate object, is generally only used with toes-- it's just a rather specific verb.
You could say that "he hurt his head" or "his head collided painfully with [an object]," which would be a bit more formal-sounding.
I would guess that there is some sort of head-bashing word scale.That's very true Packard, another common term would be 'bump'.