Work advice

I had been working FOH in a restaurant for 8 months and just last month was given the opportunity to work in the kitchen. But ever since I started in there I’ve been miserable, extremely stressed, and I’ve noticed that my mental health is deteriorating. Every time I work my manager tells me stuff that I’m doing wrong, when I’m doing things the exact way she told me to do it, and she’s constantly talking down to me. I feel like there’s no way I can please her. (I was even told by another manager that she claims that she doesn’t experience emotions.) I’m planning on quitting tomorrow, but I’m unsure what to say, as well as if I should give a two weeks notice. I would honestly love to just be done right then and there, which I could do as I live in an at-will state. Just not sure what the right thing to do is. Thank you in advance.