I don't normally read this forum, but I saw your message on the "just posted" list and just had to reply.
First, I am so sorry for your losses. It horrifies me to read about your husband's response to your pregnancy and miscarriage. I am really sorry. You deserve better.
Second, I want to congratulate you on your level-headed decision making and your courage.
As the daughter of an woman who never left her abusive husband (my dad) despite clear signs that she should, I want to thank you on behalf of your children when they're all grown up. I learned much from my mom that, at 30, I'm still struggling to unlearn so that I can face life in a confident, brave-hearted way. By leaving, you are teaching your kids that you are worthy of kindness, of love. You are also teaching them they they deserve kindness and love that that they have in them the strength to seek a good life.
What you are doing is giving your kids a gift for their future. Please stay strong and reach out for support wherever you can. If you have a hard time finding someone to help with the kids now, consider asking to have the meeting rescheduled, or look for other, unexpected possibilities. Trust yourself. Believe that life can be better than seems logically possible. Now that you've left, just keep moving forward. Keep your momentum. You're doing the right thing even though it's hard.
I'll be thinking of you.