Hi, first post! 
Sorry if this ends up long. Don't want to drip feed.
DH has long had issues around drink. Things that have happened over the years include generally getting very odd, a bit nasty, and not remembering anything after a certain point. Once, he got up out if bed, urinated all over the floor went back to sleep. Also before we got married he smashed up a hotel room and was cautioned by police. This us when we agreed he would stop drinking. I did too. Everything fine till last Christmas when he decides to gave a few festive drinks. All ok till Boxing day when he turns nasty, starts accusing me of weird stuff. In the morning I told him what had happened, he obviously still couldn't handle drinking so no more. Then a few months later he went out for a work thing, supposed to be back after an hour or add so, went completely no contact after sending an odd message. Eventually brought back by a policeman about five or six hours later, having been found at the side of a road after trying to walk the six miles home. I went ape shit this time. He was very weird, accusing me if things, nasty. I videoed him and made him sleep in the garage. Was worried about what he could do in that state without even realising, especially with DD (then 2) in the house. Showed him video in the morning. Told him to go to AA. Agreed he wouldn't drink again.
So, last few weeks he has been a bit odd, a bit grumpy in mornings. I thought he was a bit drunk at least once, but wasn't sure. Then last night I was out at a parents evening. After I came back, a bit later after we had eaten, I knew he had been drinking as he was slurring a bit and stuff. We went to bed. Thought I may be wrong and I would figure thanks out in the morning as I was so tired. He woke me up stumbling into the en suite at 12.45, light on, door open. I tried to go back to sleep, but then loud banging woke me up. He was either punching or hitting his head on the wash basin. I was still unsure what was going on, thought something had maybe come loose? (half asleep!) Then more banging and he is repeatedly hitting his head on the heated towel rail. I had to shout at him to stop. Told him to go sleep downstairs. He was fumbling around on the landing and turns out he was grappling with a clothes airer that I left out there, and had chucked it into the spare room. He was standing there completely out of it. Had to direct him downstairs.
This morning I asked him what the hell happened. After a while of silence, he admitted he had been drinking rum (hidden in the garage) and had been doing so for a few weeks. He blamed stress at work. He is a teacher too at a new school and said behaviour of children is really bad and he can't cope. He has been to the doctor today, got signed off and gone to Addaction. I have asked him to go stay at his mum's for a bit. I just don't know what to do though. We gave DD who is 3, and I am 5.5 months pregnant with DS. Amy advice? I'm not sure how I can ever trust him again.