On a completely unrelated note, I wonder what happens when a mage gets drunk. Can they still use their magical powers because wow you wouldn't want to be in the area.
Well, it shouldn't be too different from some mage turning angry, evil, insane, daydreaming, having nightmares, turning into a troll,
or developing his abilities a bit too early for his formation to start, or, for that matter, any mage growing up someplace where said formation somehow happens to be not readily available.
I guess having a couple peers of his at hand is your best bet.