I used to see a migraine specialist and I'm also a medical student so I read lot's journals/research. Here are some recommendations
1) If the imitrex isn't helping he might try switching to a different abortive medication such as relpax.
2) If he has them very often he should try a medicine to help prevent them and decrease the severity. Excamples are Atenolol, Amitryptaline, and Topamax.
3) 1000mg of tyelonol has been shown to be affective for migraine pain. So for kids, I would have him take the highest single does he's allowed.
And for me, triggers are not eating regularly, and stress.
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