If I was to go the council would I have to explain what happened and why I cant go back
Then if that's what you need to do, that's what you need to do for you and your DC. It might be unpleasant but it's what you need to do to get a home. So you grit your teeth and do it.
Or better still, the refuge.
There is help available, you just have to take it. So you have a bit of a boring/annoying afternoon at the council offices-big woops. Then it'll be sorted to some extent, they will give you help of some kind.
Or, you get a refuge place sorted and you go there.
You say family can't help you, so you'll have to access other services.
If you can't be arsed then no-one can help you. I suppose people often leave several times before they leave for good.
Do you suffer from anxiety or some other MH issues and are you getting treatment for it? If so, you could see your doctor/consultant, hopefully they can consider other treatments/meds so you feel more able to do what you need to do.
You could still start organizing the refuge place now, or go to the council offices whenever.
If you go back it's so much harder to organize something though. And imagine how he will treat you. 