cloudbase welcome......Your story sound just like mine. I was fine after DD1 (now 2.5yrs old) but since DD2 was 3 months old (she's now 6 months) I've been feelign pretty much how you are describing. I kept wondering if I had PND. It sounds awful to say this, but I just didn't think I was the sort of person to get it (that's not meant to sound derogatory at all btw), just that I am normally so strong, happy, in control, mega organised (to the point of envy of all my RL friends). I feel like I am the complete opposite to my normal self.
I kept putting off seeing the HV/GP as I was scared that it was PND, but also, I kept having good days, even good weeks....the thing that made me talk to someone was one of my BFs telling me she had had PND (never told me at the time although I had my suspicions) and she said she didn't get help for 9 months as she would have the od good day. It made me think I had to speak to the HV, which I did last week.
I have since spoken to several friends who have 2 young kids, and they all agree to finding it bloody hard work, but when I described the tearfulness and extremely short temper (poor DDs ), feeling of not being able to cope and that I'm just about treading water, they all said they didn't feel like that. It was hard to admit, but it did make me realise I do have PND.
In a way it's been easier now I have a diagnosis. DH has certainly been a lot more respinsive (instead of just thinking I'm a moody cow!).
I'm not saying you have PND, but I do strongly suggest you speak to either your GP or HV about how you are feeling, esp if you had PND when DS2 first born and have a history of depression.
So sorry for the 'selfish' post the rest of you...
Thanks for the (((hugs))).
I'm sending good sleep vibes to all the little early birds.....