Struggling with Toxic Relationship and Stress: Need Advice

How do I keep my sanity for the next 6 months??? My daughter(15) and I live with my boyfriend and his kids in a house we own mutually. The first bunch of years went great, we were young, dumb, playful and had a great time. High stress was always hard for him though, even vacations. After buying the house, stress went up! and my health plummeted. he started making more harsh jokes "you can't make a wife out of a ho" (we were discussing our mutual hesitancy to remarry, and for the record I never cheated or anything) but stuff got increasingly mean for no reason. I felt worse. my stress went up, my health went further down. so as I was spending more time incapacitated by both very real mental and physical health issues. he had to take on more and more previously shared household duties. his need to control every detail and have everything done just right and in the right order made it very hard to actually feel capable of doing anything at all. I broke down more so he would have to take on more. anyway in the time we have owned the house he began losing control of his frustration, anger, and resentment, resorting to screaming at me, tearing me down emotionally, using everything he knew, all my insecurities against me. I recently got new meds, since apparently a lot of my issues that had been so drastically declining were a result of my thyroid failing. so I'm now on a path of improvement, and I'm coming out of some DEEP brain fog. he told me about month ago, right after I got my new diagnosis, that he couldn't do it, he wanted to kill himself. and that I needed to step up. totally fair. but he also said I needed to get my daughters life long health issues under control. (not like I haven't been trying for 15 years???) BECAUSE she is somehow a threat to him. he is scared that her inability to hold her bladder overnight, which means we do a lot of laundry, will cause his kids to not want to be with us but at their moms full time. because sometimes her room has an odor in the morning. what he said though, was basically that she is a threat to his family. it's been 7 years and my daughter is not family to him. I am not worthy of any kind words or emotional support. we are a burden. he hasn't even wanted any physical intimacy for well over a year due to his health issues. it's a joke to say we have any type of relationship at all anymore. we barely speak to each other once a day tops, only as necessary. it's been weeks. I will not give in. I'm not coddling his silent treatment, angry outbursts, or cold hearted bullshit any longer. I will not walk on eggshells anymore. but we have things we have to do on the house yet before we can list it... I can't afford to move out and then fix it, mortgage and rent at the same time is a giant nope. we haven't even discussed that its technically over. I think it's obvious? but anytime I try to express a feeling it gets turned around on me and screamed about. so like, I don't know how to go about this conversation... I don't know how to survive six months of toxic angry crap when stress makes me so much worse so fast. thanks to anyone who reads my novel, and I appreciate any thoughts or insight.