Please don’t flame me for this, I’m struggling enough as it is 
I have a 2yo DS and a new baby DD, 3 weeks old. I’ve been increasingly struggling mentally, feeling really low, crying a lot and losing my temper constantly.
But my feelings are related to my DS, not the new baby. I can’t cope with him at all and I feel myself getting so angry with him all of the time. His behaviour is getting worse, he screams, shouts, clambers all over me (I had a c section so this in particular makes me really angry) and does absolutely nothing he is told. He is also aggressive sometimes with his baby sister which really upsets me. Rationally, I know this is normal toddler behaviour but I feel completely unable to cope with it. I feel like an awful, shouty mum and he deserves better than me.
Everything written around PND focuses on feelings towards the new baby, but DD is a dream. She is so good and I feel really bonded to her, there is no issue there at all.
When I was pregnant I was worried that having another baby would affect my bond with DS, but everyone said this worry was normal and our bond wouldn’t be affected at all. I feel like I was lied to. I would never ever regret having my lovely DD but in a way I regret having another as I feel it’s destroying my bond with my eldest. I feel so sad about this when I think about the lovely bond we used to have and I’m scared he will end up hating me.
Is it possible to have PND but your feelings not be focussed towards the new baby? Has anyone else had these feelings and gotten through it?
Thank you