to suspect that my irritation might be PND- or depression-related?

[SheepNoisesOff]

This is not exactly an AIBU but there's more traffic here and I'm feeling a bit blah to be honest.

I had DC2 three months ago and for the most part things have been going well and I've been really happy (unexpectedly, because when I had DC1 things were ok, but not amazing, and I wasn't expecting to be on cloud 9 this time).

However the past few weeks things have been getting more stressful, especially workwise (I work for myself, and live in a country where maternity leave is short). A few annoying things have happened but it was only today that I thought to myself that perhaps things are not actually as irritating as they feel like they are, and that I am getting upset and angry because I am a bit off-kilter thanks to giving birth fairly recently.

Sorry for being fairly vague but I don't want to out myself. It was just today when someone I work with mentioned - very kindly - that she didn't think a particular situation had turned out as bad as she had expected, given how angry my email had been, that I thought hmmm, perhaps my anger is not really warranted by the situation and is instead coming from somewhere else.

I have a history of depression but haven't experienced it like this before. I take ADs but not really sure what I should do next?

Hope this is understandable, got DS climbing all over me right now! AIBU or is this a feasible explanation?

[Snoopingforsoup]

Hmm. Hard to say as your post is vague.
I would say your irritation is tiredness and hormones with a new baby rather than a cast iron sign of depression.
You are allowed to be irritated and it's easy to read emails wrong.
I would try to relax and do as you are doing which is keeping an eye on yourself.
Take it easy.