I feel like I'm going crazy

I'm so tired of the arguing. She acts psychotic one day and the next morning she wants to be my friend and laugh and get coffee together and act like a mom. Tonight she berated me as soon as she got home from work because I cooked and the sink that was already pretty full, was now even more full. And even though I worked today too, vacuumed the entire house, took the dog for a walk, have homework for college, and cooked food for my brother and boyfriend, I am somehow to blame!!! She calls me a slob every day recently. "Fucking slob" that's her new favorite name for me. But my brother can be jobless, not take the dog for a single walk for months, never do a chore in his life, yet I am always the problem!! Never him. It is actually insane how little he does around the house despite being older than me, but I am always getting screamed at for not doing anything. I can tell her this everyday and she still won't listen or stop saying it. And she starts her shit with me getting all irate about stupid shit and she knows I'm going to argue back and give her a reaction. It's like she just wants to see me fucking suffer and yell at the top of my lungs when I wasn't even mad before she got home.

It really makes me think about it and just say wtf because I cant imagine coming home and being genuinely furious about dishes in the sink. DISHES IN A SINK? it's accumulated since yesterday, when I did all the dishes. Not like its been sitting there for a week. I don't know how she has the energy to fight constantly. And I don't understand what i did to be her scapegoat and why she views my brother as so much better when I do so much more.

I'm sick of all her shit. Since I was in high school YEARS ago to now while I'm working, she threatened me with not driving me to school and making me walk and now she threatens me with not driving me to work. I hate all of her threats as if school or a job is something negotiable. I would literally be 15 with her telling me to find my own way to school. (And she'd never follow through but would try and scare me just for the hell of it).

Will it ever get better? Somedays she acts like we're friends and we get along good only for this to inevitably happen. It's a cycle. She guilt trips me when I say I want to move out eventually and she acts like she's sad. But she tortures me with her bullshit all the time. Then it's back to being nice 🙃 until she snaps.