I hear ya! YANBU.
The other day I had had e-fucking-nough! AND DD (25 months) does not yet go to nursery (but as a result of last week is starting VERY soon). I was sitting at playgroup with her, she was out of earshot btw, telling anyone who'd listen that I love her very much, but that I just don't like her right now!
I'm also 34 weeks pregnant - ha! Who's fucking idea was that?!?!?!?
But today especially (and to a lesser extent Friday) she has been really, really lovely all day. Slept until 7.30, eaten with no fuss/throwing at every meal, painted on paper, not the walls, table, cat, self, the paper and then told me it was for mummy because I was wuvvwee.
Again, I will stress, I was imagining all sorts of things I can't type because they're too horrible the other day. I was truly ready to string her up!
You're doing brilliantly, the fact that you actually give a shit that he's crying (some people think that's why iPods were invented!) says it all. It will pass, it will get better (and in some ways worse, sorry, but mine talks INCESSANTLY, ALL DAY, sounds lovely? Hmm, for the first month maybe). Relax your shoulders and breathe. :)