I don't remember going through the exact same thing, but I know when DS was a newborn and I wasn't getting much sleep at all, I would be so cranky I would swear when I went in to his room and I mean nasty swear... I'm a very quiet and calm type person usually.

Honestly, sleep deprivation is like torture, so try not to beat yourself up too much. Sounds like you are doing all the right things. Hope the Paed can help you out xoxo