Hi Snookem...
Welcome to the forum!
Unfortunately, until your husband realizes he has a problem, the only people you can help are yourself and your son. Is he getting progressively more angry? Has he mistreated your son? Have you considered contacting a spouse abuse center in your area and getting their advice?
How does he explain his anger? (I mean, when he's sober.) Is he angry when he's not drinking?
If he doesn't get any help, and he progresses to hitting the walls or kicking the furniture PLEASE call an abuse hotline.
In the meantime... al-anon for you?
Smoke