@Orangesandlemons77
You can see from my post I'm probably not in the best place to give advice right now.
I'm just going to welcome you to the 'club no on wants to belong to' and echo the above PPs. You can't reason with a drunk so you just have to ignore their words and grey rock. But don't ignore behavior that is destructive to you and actions that directly impact you and/or your finances. And especially not your children.
I did the spare room thing. But it doesn't stop them from shouting at you through the door. And how long can you really take having to sequester yourself or keep having to move from room to room to avoid them.
I chose to leave when it got too bad. I left our home of 38 years pretty much without a backward glance and just a duffel bag of clothing and necessities. But that house had become intolerable to me and I was sick of locking myself away to avoid his diatribes. I'm in a flat (our DC are grown) and I have a calm, peaceful, and quiet home now where no one is drunk and abusive, I can do what I like without criticism, and I have no fear of the future.
So my suggestion is that you see a solicitor. Find out what separation or divorce may mean to you. You'll probably be told the same as I was, that leaving does not affect your ownership of the home. You can buy him out, let him buy you out, sell it, whatever. The fact that you have DC at home does complicate things. Educating yourself about your options doesn't mean you're going to 'do anything'. I just means that you know what you can do, should you choose.
But again, right now I'm very 'worst case scenario'. Although the truth is that they very rarely stop and things just keep getting worse.
Remember the 3 Cs
You didn't cause this
You can't control this
You can't cure this.
Also remember the 4th C
You CAN take care of yourself.