So good to hear back from you! I've been thinking of you all day, and wondering how you're doing. Sounds like you've managed to deal with everything today quite well given the circumstances. Hey, you didn't get fired so that's something to be grateful for.
I've been thinking about how my parents did handovers. A favourite spot was an open food court of a busy mall. I also remember going to stuff like a children's story hour at the local library and one parent would drop us off and the other would pick us up after it was over, so they didn't even have to see each other. A friend of mine uses supervised children's play areas like in an Ikea store or at McDonalds as handover points. And I still think it would be a good idea to bring along someone, another adult, so that you are never alone with him again.
Anyway, I'm sure that when you contact the local domestic violence counsellor then she will have more ideas for you which are tailored to what is available in your community.
Sending you lots of hugs! You're doing great!