He is only 4 months sober, and sounds like he is seriously "white knuckling" right now. He may be sober, but does not sound like he's in recovery. There's a difference. The fact that he won't seek help is worrisome. As has been mentioned, you can't be there every time to drag him away from alcohol...furthermore....that is NOT your job to control him.
You're new to all this, read the posts on here so you come to understand what you're in for if you stay in this. It is a brutal disease, and you will be in the spin cycle if you don't step away and let him find his own way. He does not appear to be willing to fight for it if he isn't willing to surrender and get into real treatment. Antabuse is not treatment.