OP - a wake up call can come in different forms, usually unpleasant. In alcohol addiction it is often an arrest, an accident, job loss or relationship break up. Or all of the above.
You can ask him to leave of course, or you can leave... there are no rules, but my advice would be to think this through and map out some support for yourself. You need to start thinking in v. practical terms - money, childcare, work etc and call on family &/or close friends to help you through.
Don't feel you need to tell them all the details (unless you want to), it is okay to ask for help when you're having major issues.
the holiday... hmmm generally holidays bring out the extremes so if things are not good, they might really blow on the holiday. Does he usually drink on holiday? Because if so, I would suggest you cancelled, or went either alone with your child, or with a friend. It might be the cooling period you need to reflect.
I do think you need to sit down and talk this through with him when he is sober and undistracted. Say how you feel about his drinking/what it does to you/your fears for your child/ and what you would like him to do about it. Say also that you do want to be with him if he can manage his drinking to a point that you are comfortable with (though I suspect he won't be able to do this. He is drinking v. heavily)
Sorry OP, it's a tough time for you.
The good news is that you are on the brink of taking charge of your problem and making strides to a better life.