I suppose letting the situation build up led to your own annoyance.
Engaging him more actively in the tutorial process -- specific
questions, getting him to rewrite a passage, to read aloud, to explain
something -- that might have helped. Of course, the student is
responsibile for his own behavior. If, after a few times, you failed
to interest him in his own paper, you might simply have said, calmly,
"I see that now is not a good time for you to work on this. When you
are able to concentrate, why don't you reschedule, perhaps with a
different tutor?" Or something to that effect -- calmly, without sign
of anger or annoyance. The idea is to keep professional, stay on task,
and encourage the same behavior in the student. We don't have time to
waste, so I wouldn't wrestle with the student if he can't stay
focused. You might also mention in the appointment note -- without
exactly tattling -- that the student was not able to concentrate, and
the session was cut short. It could be the student does have an
attention problem...but it sounds like it might merely have been a
"hormone problem."
Any other wisdom on the issue?