Yes Josiebear. Not at a personal level - I was spared the horror of PND. But as a Health Visitor I saw it, helped treat it, and yes, sometimes with nans and colleagues who found themselves reliving it all.
I often think that traumatic and difficult events cycle back in our lives, triggered sometimes by certain situations or memories. This may be what is happening to you.
Sometimes, when mums expressed fears about what their 'dark thoughts' might do to their baby, I would ask "how would you treat your baby differently if you didn't have PND?". True, a very small number are a risk of some kind to their baby; but most, even quite bad cases, still care for and love their babies, and the babies thrive. Most babies are not brought up in perfect families!
If you have a daughter who loves you and is 'an amazing mum' then you did a much better job than you thought!
I don't know whether sharing on here, or with your husband might help - I would not suggest sharing with your daughter. If not, it might be time for some gentle therapy to help you see past this darkness. I hope that you can.