6 months pregnant and stressed!

I'm currently 6 months pregnant. It's my husbands and I first baby. I'm stressed out and thinking about giving up on our marriage. Every since we found out we were pregnant my husband has been partying none stop. Coming home all hours of the night, not answering his phone, lost his job, and just acting like he has no responsibilities. We have been together for 9 years and married for 3. He wanted a baby so bad. We finally are pregnant and now he's acting like this. I don't think I can continue going on like this. It's unhealthy for my pregnancy, my blood pressure is up because of him, he out drinking and driving, spending money we don't have. I'm so close to packing up and leaving. Not only for my health but also to hopefully open up his eyes. I've asked him to go to counseling and he wont. I don't want to leave and breakup my family but I don't know what else to do. I just want him to go back to the man I fell in love with. Should I stay or should I go?