I'm not surprised you are feeling irritability. You are liable to feel all kinds of things! Congratualations though on staying sober. You just need to remind yourself that you are going to feel anger, irritability, fear, anxiousness, and lots of other things. This is normal and it will pass.
When you feel something negative, *pause*, take a deep breath and remind yourself that you ARE sober and that is something to be proud of. Just go easy on yourself (and those around you!).