QP - I know that it does take people a very very long time to gather the strength to leave abusive relationships, and I do not thnk women are to blame for that. The very dynamic of abuse means that you stay in a relationship that a non-abused woman would not tolerate.
He is abusing you emotionally, psychology and economically.
I think getting some counselling for yourself is a very very good idea. IMO you can't be expected to pick yourself up and walk away from man who has been systematically breaking your legs without a crutch of some kind.
The problem is that if you on't get a crutch, this man will leave you, and you will be lying on the ground for some truly low-life jackal to come and find - and you will end up in an even more abusive relationship. Sorry - but that is the reality for a lotof women who wit to be rescued. You are intelligent - i know you will understand that.
So...go to your GP and explain what has gone on this last few days - including the fact that on Fri night you felt you had no choice but to look for alternative care fr a child you were desparate enough to consider making motherless. Or tell that to the Crisis team. But tell them you wnat the help to rebuild your self-esteem and courage and that you wnat to recover from abuse and the neediness that enables it.
afaik, Relate will not see you as a couple if they believe the relationship is abusive. But they will see you alone.
maybe you could find out if your local SS runs a 'Freedom training' course for women who have been in abusive relationships (it includes emotional abuse) - maybe your HV would know that?? Maybe you could call Women's Aid and find out if there is a course like that in your area or if they run something similiar?
Start to identify help now, as much as you can, before Wednesday - so that you already have the beginnings of a crutch which is not him.
I know people often don't feel strong enough to go when others would...but you can start to identify help. Not just over whether this man stays in your life or not, but for yourself, to find the strength and enjoyment you can have in life irrespective of ANY relationship.
Good luck, QP - you are worth anything that good luck blows your way - but the good things you go out and seek for yourself will be worth even more.