Good aversion therapy there. 😉
If he’s always gotten headaches, then there is no change. Adderall wears off, he’s angry, he gets headache. A booster dose might help.
Stress triggers headaches in some people. Anger is stress. Sleep apnea can be a factor too.
I’m a whole lot less irritable on Adderall because my concentration isn’t so fragile. For me, the tail end of the half life still helps into the next day. But that’s not typical.