D.
Personally - it sounds like he needs to see a psychiatrist.
Dealing with sleep issues and alcoholism is tough work. You don't trust him.
My husband had a stroke in December 2016 - since then he has been dealing with insomnia and restless leg. He drinks beer. He doesn't drink the hard liquor. I don't like it when he does because he becomes nasty - he's not a fun drunk.
Using alcohol to get him to sleep is a bad sign. The other signs are lack of showering and hiding the alcohol from you.
How do you get him to leave? You tell him it's over and have him pack his bags.
You let your daughter know that you've made a decision that is best for you and her. It's YOUR relationship - not hers.
If they are close - your daughter and SO? You can tell her that they can keep in touch. I personally wouldn't allow it - but that's me. A teen doesn't need to be influenced by an alcoholic with other issues.
You can help him leave by helping him find a place to live.
You can help him leave by telling him he MUST seek a therapist and GO. not for YOU but for HIM.
Change the locks.
Put an alarm system in the house.
Ensure he's not on bank accounts and important things like that.
Ensure he can no longer pick your daughter up from school.
Let your daughter know that he can't pick her up from school. Get a code word for the two of you so she knows if you have a problem - the person picking her up knows the word to use.