25 weeks and unable to control my emotions

This is my third child and I've never ever felt like this before, with my 1st it was nerves and with my 2nd just heightened eastrogen levels and with baby addi I feel guilt and stress.

I love my little boy whos my first like no other and hes just turning 3, but he's challenging me and showing resentment and all I want to do is love him.

My little girl is cheeky and care free and she just loves to be loved but she's 1.

I just need some guidance on how to make my little boy loving and happy to be around me, I'm exhausted with the power struggle and this pregnancy is taking its toll.

I have placenta previa and feel so poorly compared to my other pregnancys