Just that really. They are 100% centred on imagining horrible things happening to the dds. The dds are fine and we have only been to a and e once years ago because I thought dd1 drank a tiny amount of nail polish remover.
Here is an example. Today we went to a 1st birthday party and everything was normal. So I am imagining dd2 will not reach her first birthday. Later on exh took the dds swimming so I drive myself mad thinking he will drop dd2 and her skull will smash on the tiled floor. He has never dropped either child.
A couple of weeks ago they really moved up a a gear and I imagine really grim scenarios.
I have googled pnd and list natal pschycosis but its not exactly either of those its just intrusive thoughts 
I haven't done anything weird though. Life carries on as normal
I'm just not enjoying it much.