I'm really sorry you're going through this. I definitely think a separation time would help. Maybe you can move back with your parents, or family members, while he tries to help himself. But he definitely needs to want to help himself. My hopes and wishes are for you and your son. Please take care.
If he does it again, please please get out. My mom was in an abusive marriage for years. I watched my sister hide behind a couch when my dad physically abused her. I stood in front of him holding a knife because I was trying to protect my mom twice. Luckily, he stopped once I went to college.
I don't want your son to go through the same thing in his toddler years. It leaves emotional scar. I get sad whenever I look at my little sister.
I hope everything will be okay.