@Sophie2210 I'm so sorry to hear about your baby. It's not like you needed any more sadness right now, and it's difficult to process grief when you're depressed anyway. It sounds like your DH just trotted out the traditional "supportive" (not remotely supportive) comments people make when someone loses a child, which just end up dismissing the child and minimising the experience.
Don't get angry with yourself that you're not happy, it's a symptom of the illness. It would be like being angry at yourself for feeling pain!
My eldest died when he was a baby, never left hospital, so when I brought my second child (now default eldest) home, everyone expected me to be ecstatic. I was not. I had crashing depression, but felt far to guilty to tell anyone. I should be happy! My baby was safe and well! What was wrong with me that I couldn't connect, found everything one long drudge, felt flat and emotionless all the time? Why was she so clingy, why were bedtimes such an exhausting battle, why was it always me, me, me she wanted? It gradually abated, but I was dreading the birth of my youngest. I couldn't go back there again. But I didn't! I loved it. I was really enjoying both my baby and my toddler! Yes, there were crappy bits, but most of the time, motherhood was a lot of fun.
It was at that point I realised how ill I'd been with eldest, and how unfair that had been on her. How it had impacted her, and our relationship. I'd had an incredibly traumatic experience (PND is horrific) and it had left her with attachment issues. I really, really wish I'd got help. Honestly, the difference between the two experiences of parenting is incredible. Don't do this to yourself, or your daughter. Whatever is stopping you from telling people in your life the truth, fuck it. You are not obliged to soldier on, to try and see it through, to put yourself and your child through this horror for any reason. Like I said, there's a clear, very effective, clinical pathway for this. You're not alone. Many, many women go through it, and that's not how it's supposed to be. Believe me, it's so much better than you are experiencing.
@CaMePlaitPas same goes for you. It's not supposed to be like this. This isn't "natural". Call the HV, please. Not for some randomer on the internet, but for yourself, and your kids.
I could cry for the pair of you.