wbw, I understand the stage you're in. When I came here I was broken and in complete denial. I couldn't fathom that my then h would hurt me or our kids, but he did. I wish I could sit with you and give you a hug and encouragement. This is really hard. Regardless of the circumstances, ending a marriage is very painful.
You're on the right path to protecting yourself. Copy everything you can find including all communications between you and your h. Familiarize yourself with the main family law codes in your state. Keep notes and create a timeline. I hope you never need any of it.
wbw, you will be ok and life will be good again. I can remember the times I was literally on the floor in tears and completely despondent. I've recovered and am forever changed, in many good ways, after what I've been through.