So much more info now Telegran.
I would be sly. Get 'back to normal' with him. Meanwhile, prepare yourself for leaving. Get all your financial stuff together - insurances, house deeds (although I believe these are on the Internet now), bank account details, savings accounts, etc. (And a recording of him being aggressive is a great idea.)
Get all the help you can. Posters have mentioned 'Women's Aid', and do try to sneak out to see a solicitor. Once your decision to leave is concrete, marshall all the forces available to you.
You say that you have somewhere to go. That's a big plus. Could you get some of your clothes there in advance, so that you don't have to 'pack and go'?
Your strength and resiliance now could well be a guiding light to your children, who are having difficulties of their own.
The very best of luck to you. (You can do it!)