He Left for good

I'm so distraught right now. My fiancé and I have had issues since our son was born 6 months ago and have fought harder now than we ever did when we were just dating. My fiancé is very hot tempered and after drinking all day we got into it over something so stupid. He called me every name in the book (the whole time I'm holding our son) and screamed at me about how I'm such a crazy bitch and how he's "sick of me". We have had this same exact fight many times. This time when he left he texted me saying that I would be hearing from his lawyer on Monday. I'm a stay at home mom with $18 in my bank account and nowhere to go. I don't know where he is or what he's doing and I feel more anxious as time passes. I don't know how I'm going to survive this. I just want my son to have a good life.