My nmom threatened to kill my boyfriend

She was berating me for 2 hours for god knows why. We had a nice time, i agreed to her wishes and we went to a restaurant and then to the cinema, it was all going well. Then we got back home, i was irritated because i was overstimulated because of the social activities today and i wanted to go to sleep so i answered her with dry answers, explaining that i was grateful for everything but wanted to go to sleep, but she took it as rude behaviour and started asking me why i always act so cold towards her, while when i see my boyfriend (who she calls a complete stranger compared to her) i instantly smile. Even though i avoided answering, she brought up the therapy session on which she eavesdropped 2 weeks ago and heard everything i had to say about her, and she mentioned my boyfriend in particular because in that therapy session i said how she mistreates him and expects so much when he comes to our house, because she always uses him as a free grocery uber or a taxi in general instead of her getting her ass up and go with a bus.

So she was all like "so it's not normal to help family now???" and saying how he should get used to the traditional family and be a real man by taking my hand in marriage (he's 20 and i'm 19) and do "man" stuff like mowing the lawn, fixing stuff and making cement. She also weaponized our past relationship problems, saying that his past need of a break was childish, and if he ever "hurts" me in the slightest she'll kill him, pointing to the knives in our kitchen. The more she talked, the more she was enraged, and she'd occasionally fake herself snapping out of it by saying "i love you so much, i just want to know what's wrong" and then continuing to berate me. I was so stressed that i threw up in the kitchen sink and was suffocating, throwing up mostly because my airways were blocked (like i forgot how to breathe), and then i held to the sink for my dear life scratching it, because i was trembling and my legs gave up for a couple of minutes.

All the while she was on her phone, acting like i'm faking it, and then she did some of hed usual weirdass hand movements like she's exorcising me, saying that those are all demons coming out of me, and then she continued pressuring me nonetheless. In the end she forced me to bawl out a tiny part of why i act the way i act with her, and i said it's because she yelled and beat me instead of comforting me when i was a child, and she obviously answered "that's all? You were always a sensitive child, you got beaten a couple of times max and you're whining, while many children love their parents even after they rape or beat them severely daily".

She had crazy eyes. Wide open, very tight pupils, and an aura that screams "dangerously unstable person". I really want her hospitalized but it's literally impossible. I had to fake smile and hug her for her to let me go. She's getting more dangerous the more i rebel and i don't know what to do.