Stop telling yourself you're buggered and can't leave. As soon as you do that you're backing yourself into a corner because you've fixed your own mindset and you're condemning yourself and your children to this life.
Tell yourself instead you CAN get away, and create a life you want and love for your family away from this man.
You've described him:
Controlling where you sleep and denying you the bed - do you actually have a place to sleep?
Throwing out your clothes - does he tell you what you can and can't wear?
Isolating you from family and friends - how has he managed that?
The behaviour you're describing is abuse. You say he's horrible to you - it doesn't have to be physical violence to be classed as abuse.
Focus on what you can do.
Find out if there's a family solicitor in your area who offers a free half hour consultation on separation and divorce. They can tell you what your rights are.
Look at your finances. What is the household income and the bills? Do you work? Have you any savings? A pension? Are you claiming any benefits you're entitled to? Open an account in your name only and start saving.
Reach out to family and friends. Tell them exactly what's happening and ask for support and help.
Contact Women's Aid - they specialise in this.
Changing how you think will help you feel more in control of how you feel, which will help you start to take action.
This is your and your children's future you're going to be changing and improving. You don't have to suffer it any longer.
womensaid.org.uk/