Hi there Positivesteps, welcome to the forum. I hope you will find it a supportive place. I am sorry to hear about what you are going through. Unfortunately, it is not uncommon for abusers to try and control through the children after the relationship has ended.
Do you have any ongoing support in place? If not you could get some ongoing support through your local domestic abuse service, you could also get some support from Women’s Aid through the Live Chat.
Best wishes
Lisa