The children are the ones that suffer

I'm doing this anonymous because I'm so ashamed of what my little family has turned into. Me and my son's dad have officially split up after being on and off through my pregnancy and up till now when my son just turned 6 months. His dad has no respect for me we had a huge argument in front of my son and family which I regret doing, it was my fault as well for letting him come into my house and treat me how he wants. Point is he's came hungover smelling so much like alcohol when picking up my son and I hate it! He physically abused me before while being super drunk and since then I always gave him shit about drinking. It worries me that he's hungover when picking up my son or that he might still be a little drunk!. What do I do?? I don't want to make this any harder for my child but If it comes to worst I will be that over precautious mother. Please anyones advice will help!