Alone

I gave birth to twins 3 months ago and I’m finding myself feeling more and more lonely as time goes on. I do everything, the cooking, cleaning, bathing, shopping, clear up after his other kids and literally just have to listen to how tired he is or how I’m not doing things right, when actually it’s him. He’s not doing the nappies properly causing them to leak, he’s not cleaning the bottles properly etc but I get the blame. We take one twin each every night, we have the same one because he was worried about the others health conditions but even in the time he is home he doesn’t spend as much time with twin 1 as he does twin 2 and it’s really all starting to get to me. I just feel like I’m constantly being put down and that I’m incapable and I’m really struggling. Has anyone else felt like this?