amj,

What is his blood pressure like? A common problem from a head injury is a malfunctioning adrenal system. In some, it is called adrenal-cortical hyperfunction. A beta blocker may help.

Get a home blood pressure kit to check his BP when he is exploding.

When he gets angry, he is likely as scare inside him mind as you are. The feeling of loss of control only make it worse.

My best to you.