getting frustrated

Sometimes I feel like I'm married to two different people. He can be very loving and sweet sometimes, but can switch on a dime to mean and hurtful just because of one benign thing I said. Case in point, I asked him what he wanted to do for dinner before he took a three hour nap. He said he didn't care. Ok no big deal, but I have to pick all the time and I didn't want to for a change. So he wakes up and asks me if I figured out what to do for dinner, and I tell him I don't care. So he says he'll just make a sandwich. To which I say, could you grill my sausages for me then? And that flips it and he starts going on about how I expect him to make dinner for me and I can never do anything for myself. So I tried explaining that the sausages were the closest thing I had for a sandwich for myself, and he's never shown me how to use the grill, he always makes them for me, but he still kept angrily going on about how dare I expect him to make my dinner. I guess lesson learned, when I do want the sausages I will watch a YouTube video and figure it out since he will never show me, and heaven forbid I ask him. I know it's not hard, but I've never been shown. I immediately left to go find something to eat on my own. I guess the point isn't the grill, it's the fact that I never know what is going to set him off and I'm pregnant and emotional and I can't handle it. At. All.