Frustrated AsF

I am so beyond frustrated and exhausted and it seems like he doesn't even care. I'm a SAHM of our 5 year old boy and 6 week old girl. When our boy was born I felt like a single mother. I did literally everything. He played video games. I had to ask my MIL and SIL for help anytime I needed to do something like go pee or shower. He literally did nothing. As years have gone by he's become a great father to our boy. When we had our girl 6 weeks ago I thought it was going to be the same way. But he wasn't working and was adjusted to fatherhood and helped a lot for the first week. After the first week he started a new job and ever since the first day of work it's like everything at home has gone right back to how it was with our son. He comes home from work and sits on the damn computer. He'll hold the baby if I need to make a bottle or something small like that. But she goes to the bathroom with me, she goes outside with me, I have to go back and forth with her when I'm doing dishes or cleaning... On top of everything with our 5 year old. And even if he sees me struggling he just watches and goes back to his game. I ask for help with small things and he can't even do that. I'll end up taking the garbage out after asking him for 2 days. And I have to clear off all the dishes at the computer desk cuz he can't even get them to the sink. Not to mention the dirty socks he leaves next to his chair and all the dirty clothes on our bedroom floor sitting next to the empty laundry basket. I'm going insane. I've tried telling him that I'm overwhelmed having both kids at home all day and housework plus being on call to a newborn all night every night. I've told him I need his help and how I feel about how he's been since he started working. Nothings changed. My MIL said just give it time. I'm running low on patience with him and kids. I haven't had one day off since our little girl was born. Every second I'm awake is either taking care of one of the kids or cleaning something while he stares at a screen 6-7 hours a day after work. And because he's the one who's working I shouldn't expect his help with anything around the house or with the kids. Seriously our baby is 6 weeks old and he's not changed 1 diaper... NOT ONE. And not once has he gotten up with her at night. He's actually given me an attitude for her crying waking him up one time at night when she was constipated. I've tried talking to him to express how I'm feeling 3 times already. I want to just cry. I just need a break. Just one fucking day to go pee by myself or take a shower and not cut myself trying to shave really fast or eat dinner while it's still hot and not after everyone else is done eating. He's seriously sitting 6 feet from me right now with his headphones on while I'm crying and feeding the baby. I don't know what I came here for. I guess if u have advice then go ahead and post it. Keep in mind I've already talked to him 3 times and every time I've asked for help with housework or the kids it gets ignored. I guess I just needed to type it all out and get it out since I can't talk to anybody. He's across the room from me and I've never felt so lonely in my life.