Dear Happy. The visit with your babies must have been so incredibly difficult. But please try to remember that children do not like change, they are little creatures of habit. It may seem like they hate you at this moment and that you have ruined their world. You absolutely haven't. You have done the opposite. It is just that they are also going through a period of immense change which is always unsettling in the short-term.
The other option - staying with a violent man - might seem easier in the short-term. Because that is what you are all used to. But in the longer-term, it would have been awful for you and your children. Your son and daughter would think that it is the norm for a relationship. They would not have stood a chance of forming a healthy, equal, respectful relationship. Imagine your daughter being beaten and raped. Imagine your son ending up in prison for perpetrating DV. Sorry to be so blunt and brutal, but that is what would likely happen. Also, you only need to read the threads on this board to see that adult children who have grown up in homes where there is DV are understandably so angry at both their parents - the one for not leaving as well as the perpetrator.
I'm so sorry that the visit was unsettling and upsetting for everyone but you have come so very far. Could you ask the nice nurse or a therapist for some advice on this - is it better that you continue to see your children every day or would it be better that you don't for a little while.
I know this is completely utterly different but when I had my first weekend away from my kids my mum asked me not to call them as they were so unsettled when I did. Also, as Spring says, they can take a while to re-connect. My DD seemed unsettled for a few days. I actually said to my mum, it's as if she hates me for leaving her for a weekend. But they so quickly come round.
Your beautiful children need you to be strong and well. You are doing the right thing - for you and your children xx