PTSD & confrontation (solving Other people's problems)

I'm so fucking tired of being stuck in the middle of constant screaming, and breaking up fights when I have PTSD.

I'm trying to stay calm and talk people down while my voice is breaking and I'm shaking like a leaf. Then I'm anxious for the rest of the day and afraid to even leave the room :/

All because she left the tub running and the bathroom was flooded. Then my bf says something about it and she starts screaming about how it's her fault, always her fault.

I put my hands on her face (because that seems to calm people down and make them talk instead of yell) I'm like "it's not your Fault the water was running. It was an Accident. I could've done the same thing. But screaming won't help, it just stressed everyone out and chances you going back to the hospital. It water, let it fucking go. I'll clean it."

So I sent them both to different rooms and cleaned it and told her again to let it go, yelling about dumb shit like that isn't good for anyone and it's not that big of a deal.

Well she calmed down, but I'm still nerve wracked and hes frustrated for being yelled at and blamed for everything.

How do I confront people or stop the yelling without shaking like a bitch??

😰

Eta;

Sorry I wanna stay Anon, but "she" is his grandma

"He" is my boyfriend

I live with them and she yells 24/7 about anything she possibly can

I try not to get in the middle of it because I'll be homeless if she tells me to leave. But she loves to bring me into it anyway and I've told her to leave me out of it and don't disrespect my name like that just to piss him off more. This time I brought myself into it cause I was tired of the screaming and didn't want to hide in the bedroom and listen to it, I wanted to stop it as soon as possible or she would've been screaming for hours.

Also she has AFib and on oxygen, and when she starts yelling about dumb shit she says "you're making me scream, you want me to go back to the hospital, I should just drop dead already etc"

But she's always the first to raise her voice and then throw blame for 'making her'

If someone pisses you off, yeah, they're wrong for pissing you off, but the way you respond is your own responsibility 😒 and if you immediately want to scream just because someone asked a question about why the bathroom is flooded, like, just don't fucking scream?