OP: contact WA.
Tell them you are in an abusive relationship, with a 2 year old and a DSS.
Tell them that he is verbally abusive, will not allow you to see friends, accuses you of affairs, and spends all your money.
Tell them exactly what happened when you told him you wanted to leave - tell them all the details: the strangling, the throwing stuff, the withholding of your keys, bankcard and phone.
Or
Contact your Police Domestic Violence Unit and tell them all this too.
The police and WA often work in tandem to help people.
You do need support to do this, and WA / The Police will he;p you.
Good luck.
Bear in mind what a PP said:
"Please believe me when I tell you it’s not just violence that will affect your DD, it’s how he speaks to you, the way he treats you, the way he makes you feel, the way he makes her feel" I would add:
The way she sees you running around trying to make everyone else happy but not valuing your own self.
The way she sees you taking all the responsibility and hard work, with no help or team work.
The way she sees you walking on eggshells around a man.
The way your Dss sees all this too: a woman putting herself last. Every male in the house, including him, being pandered to and tiptoed around....
Most of all, someone needs to look after YOU. Make that someone yourself.