I'm at my wits end, he insists he hasn't taken anything, told me he had 8 beers at work.
He has taken something. He's consuming alcohol. And he's doing it at work. Which is a big honking flag. It also means that you should prepare yourself financially if/when he loses his job.
If you take a peek at the Friend and Family of Alcoholics forum, you'll see this story play out so many times. Alcoholic gets abusive and blames the alcohol, as if that's supposed to make the situation better. The fact of the matter is that you are still being abused.
I was in a abusive situation myself as a kid, and it was not fun at all. I actually practiced much of the minimizing that you're doing right now.
You can read
http://www.soberrecovery.com/forums/...ml#post6067516
for all the details.
You have a kid. Do you want him to be subjected to this kind of abuse?