Help a disabled couple escape abusive parents

My name is Sarah, my fiance's name is Anthony. There is nothing in this world I want more than to live with him in our own space, safe and within our own control. I currently live with my mother and stepfather, he lives alone with his dad. Things are reaching a boiling point with all of them.

We worked around it at first. He has never been allowed into my house even for a moment. I was only allowed at his house until 10 pm, never allowed to stay the night, neither of us are allowed to fall asleep for any period of time while I am there. He is required to be home by midnight. The controls rapidly tightened, recently.

For context, I am twenty-six and my fiance is twenty-eight. We aren't teenagers. The rules have narrowed down. When I am spending time with him, I am only allowed there until 9 pm, and never on the weekends. His own bedroom door must remain open at all times as we are not allowed to have sex. We are not allowed to be in the bathroom at the same time, even if we are fully clothed. Anthony is stuck driving a beat down car that belongs to his dad, who declined when we asked if we could buy it from him. He wants us to keep driving that one under his name so that he can take it away whenever he'd like.

In my own house, my mother is seeking to run away from my stepfather, but is doing so by refusing to talk to him about any problems, sneaking away bits of money, venting to me about the entire situation and then turning that anger around on me whenever possible. She recently berated me for the shirt I was wearing to work when I was experiencing dangerous hypotension, leading to a screaming match. I can't succinctly explain it, but my mother is the least mentally healthy person I have ever met. I've been stuck under her thumb for most of my life because I'm multiply disabled and have had immense trouble finding a job that will provide accommodations. Similarly, Anthony's dad will never see him as anything but an idiotic lazy child. He refuses to see the immense strides he's made to become responsible, including overcoming his own ADHD-narcolepsy combo, that caused him to lose his last job, without any medication or treatment except for personal discipline.

Beyond having extremely low mental health in this situation, I am also constantly afraid that I will suddenly become homeless, as that is the type of person my mother is. I would not be allowed to stay with my own fiance in this case.

He makes decent money, but due to the fact that he now has to pay for my health insurance, phone bill, doctors' visits and therapy, and storage unit bill completely on his own, on top of paying rent at his own house that he does not have any rights in, we're struggling to save enough for a deposit and first month's rent all at once.

I've found a suitable apartment, which in my city is very hard to do and another affordable one may not open up for months. I need help with funds for the deposit, prorated first month's rent, application fees, background check, and a small amount for pet rent for my support animal. This is starting to feel like my last hope.