I'm completely burnt out, being threatened and abused, getting more ill, want to disappear and am worried - what more can I possibly do???

I am disabled with chronic illnesses and have been a caretaker to my mom primarily (and father who I had to stop helping due to his "new found" disdain, hatred of me; he's the first parent I started caring for in 2004 when I detected he had prostate cancer down to his dialysis and three time traumas where he ended up in ICU in comas due to very high blood sugars...current day he has dementia/ Alzheimer's). My mom has serious chronic illnesses which I detected in 2014 including a restrictive lung disease, hypertension, pulmonary hypertension, congestive heart failure, asthma and more. I have one sibling, a married brother. There was never an election, discussion as to who would take care of her - I decided to do it in spite of my serious conditions. We three live together so I'm always "it". The trauma I've experienced being the only person that knows what to do (the males expect this and literally run when something goes wrong, never bothered/cared to learn anything about her care), seeing and diving in to revive her, get her to breathe, multitasking to not lose her, calling our Dr and 911 too many times to count, watching her going out - all of it has done significant damage to me. There's so much. Doesn't matter if I'm in mid-seizure or whatever I'm the one that jumps into the fire. The issue is that my father has graduated many times with his dementia and Alzheimer's kicked in. We used to be inseparable. Since I became very ill he turned on me and has been verbally and emotionally abusive which has become treacherous and unbearable. My self care is practically nonexistent and the depression is at it's heights, scary heights. He made my brother POA on a covert mission when one weekday my brother and sister in law came over (at the peak of their work days?), were acting weird and ultimately took my parents away leaving me alone with no idea of what was happening. They set everything up to have my parents will enforced and elected the POA, my brother and somehow she has some power here. When I did figure it out - wow I can't type those feelings or words. One day my father decided to call the authorities to have me removed from the home after making up an awful lie that I assaulted my mother and into a psychiatric unit (where they had to release me as there was no basis to keep me). That experience, that place was like being in hell on earth, the worst of the stories and conditions we see on TV. He continues to target me. The only time he switches is when I have money or do something where he'll benefit. Lately he's declined and calls me every horrific name imaginable, tells me I'm a zero, a failure etc. The truth is that I'm an accomplished, incredible woman.
Unfortunately I've been in several extremely near fatal automobile accidents where I was always hit starting in 1998-2014. The details are unbelievable, honestly so bad that I've been asked for the rights of my tragedies to make a movie and/or write a book. I'm blessed to still be here. So between my life turning upside down, recent cancer which I had surgery for last December (now cancer free thankfully) yet many complications arose and made me worse, people in my family saying I am/have been faking everything (how does one fake Generalized Dystonia/Parkinsonism, seizure disorder, head and skull trauma, PTSD, chronic pain, heart disease, thyroid tumor etc etc), mom lashes out at me although I do EVERYTHING for her. She turns Judas, flips sides to his (father) when he acts out against me and they talk about me like a dog within ear shot constantly. I cannot, do not trust them and others. It's become so bad that I have thoughts I've never had and literally want to walk away. I've nowhere to go. But no one knows the depths of my days from waking up from nightmares, working on mom who takes everything out on me, running the household/budget, being threatened and abused daily, always being at the edge of my seat. I need serious help, no one hears my cries and I'm sinking.