Husband's addiction

I'm new to this & have never posted but I feel alone & just need somewhere to vent. I'm 13 weeks & 1 day pregnant with my second child. My first is 3. My husband & I have been together for 5 years & have known each other since I was 12. He's a good man. However, he has a serious alcohol dependency. It's to the point where if I even smell it on his breath, I lose it. Only because of our past with the issue. He gets physically violent & blacks out when he drinks. I've suffered multiple injuries at his hands only to hear that he remembers nothing the next day. I stay on his ass & know exactly what he's doing at all times because if I do not, he finds that as an opportunity to lie & go behind my back. I have to tell him not to drink every night before he leaves for work because if I don't, he will stroll in here drunk hours after he gets off.. I'm exhausted. We've been fighting the same fight for years now. I'm not sure what to do. He supposedly has not been drinking ever since the new year (when I gave him an ultimatum) but at least one or 2 nights a week, I can smell alcohol on his breath & when confronted, he swears he hasn't drank. I question every single word that comes out of his mouth. I hate feeling like a warden in my home monitoring a teenager.