What should I do?

We've been married for about 8 years. My DH is loves me and is great, but has an anger problem. I'm not perfect either, but he gets irritated when he doesn't get enough sleep and has a lot of work to do. I'm almost 7 months pregnant and am afraid of how miserable he's going to be after the baby is born. I don't think he'd be physically abusive, but I'm not totally sure. We're in the middle of finishing the upstairs of the house we've been building on and off for the past 6 years. He's got a lot to do and I can't help like I used to since I got preggo. I had preterm labor a few weeks ago, either because I was dehydrated or because I was helping to put drywall on the ceiling and was stressing myself out. He does care about me though. Don't suggest counseling, because he won't go and we can't afford it anyway, and I've tried to show him how to deal with his anger, but he won't listen to me. I have a psych degree, for what that's worth (not much).