I know exactly how you feel. I'm only 12 weeks preg. and me and my boyfriend have been fighting like no other. We've been together for about two years also. I know some of it has to do with hormones, but I think his "hormones" or whatever guys have are outta whack too. He seems to be getting just as angry with me all the time. I don't know if its lack of intimacy because I have absolutely no sex drive at them moment, or what. We had a huge fight yesterday because I asked him to change his shirt before we went to my dr. appointment. His shirt was so stained with grease and oil (he's a mechanic) so I just asked him to change and put on a decent shirt. He took that way overboard like I was embarrassed of him or something. After that whole ordeal we just had a long talk and I was on the verge of breaking up with him. I just can't take the fighting anymore. I told him to think about what he wants for the rest of the day while we both went back to work. He came home later and apologized for having such a crappy attitude lately, and I apologized for mine also.
We've always fought quite a bit, but we love eachother so much. Its just gotten so much worse lately. He admitted to having some anger issues (he's never hit me or anything, just gets upset easily) and I admitted to shutting him out sometimes. I really hope we can work things out. Anyway, I hope you guys can work things out!
Good luck to you!