Oh hugs hun, that sounds rough. How long have you been feeling like this? I remember having periods like that during pregnancy- seemingly small things would annoy and frustrate me. Are you getting enough sleep? (I know that can be hard with a toddler). The fact that you are running around after a toddler this time around probably means you aren't resting as much as your first preg.
Are you doing yoga or meditation or some other stress relieving activity? Go gently on yourself.
I hope you are feeling fab again really soon. Lots of love xx