Moms takes care of everyone, who takes care of mom?

I'm 3 weeks postpartum with my 3rd child. I have a mildly autistic 7 year old, he's not developmentally impacted by it but he is very immature. I have a nearly 2 year old and my newborn. My husband works across the state from mon-friday.

I have literally no friends, no family and on top of everything we're financially struggling. I drive a beat up pos, we live in a shitty little trailer that no matter how much money we sink into it, it keeps falling apart. We have 3 cats and a dog and I can't stand them. I've been trying to re-home my dog for two years and I'm about to surrender her because I can't do this. She eats diapers and socks and she has 101 allergies so she costs so much money and every time she gets into stuff she pukes or diarrheas all over my house and has snapped at my toddler. I know it's not her fault but I can't stand her. My cats are disgusting. They are very well fed, have a fountain, toys, beds and cat trees but they still get into our scraps from the kids and then puke it up, they torment the dog, tear stuff up and chew on my kids toys. My husband says I'm mean because I can't stand them anymore. Years ago I loved animals.

My 7 year old is a nightmare, he's constantly reactive and nasty. Slams his doors, kicks stuff, tells us we're bad parents. We reassure him he's good, hes loved, we don't spank, we tried putting him in therapy and he can't hold a conversation long enough to get anywhere so it was like a play date to him. And he's perfect for everyone else. He's genuinely one of the sweetest kids.. to everyone except us. I'm sick of it. Some days I just want him to go away but I have no one else to lean on.

I'm pushed to uphold this stupid standard of keeping my home clean, taking care of these stupid animals, dealing with these kids constantly, I can't even get a fucking shower on a WEEKLY basis. My partner is no help other than financially. He's a good dad but gets overwhelmed constantly, doesn't help around the house, doesn't help with our newborn at all, definitely doesn't take anything off my shoulders.

I just want to leave some days. Just pack a bag and leave. I feel like I can't fucking breath