Yeah, its early days and being irritable is pretty normal. Take it easy on yourself....that will make it easier to take it easy on others.
Oh you'll love this.....gratitude. I know, I know, but try it. Really get quiet and take a few moments (not hours or days) to find a few things to really be thankful for. Gratitude is the last thing I feel when I'm irritable. But it really helps....and it is a choice.
Hang in there. It gets better.