My mother is losing her mind. Is it time for placement?

My mother is 75.  She's been losing her mind more and more lately. She's having extreme fits of rage, screaming and cursing at me and my child. She refuses to go to doctor's appointments, refuses to answer the questions of the insurance agents, so they denied her caregiver services. She claims she refuses placement, won't take her medications as directed, she's become angry, violent, extremely forgetful, and sometimes doesn't know how or when she arrived to the present. Her speech has began slur a lot over the passed month or so, and often times she appears drunk. I thought perhaps she was taking too much medicine, but she said she's actually taking less, because some of them were making her sick. She wants to give me medical power of attorney to handle her medical needs, but then she refuses to cooperate with the medical staff, insurance, and caregivers. She has made numerous caregivers quit, even mine as I am also disabled due to my injuries, and also require a caregiver assistant on a daily basis. She is literally impeding my needs, her own needs, and my daughter's needs. I can't take care of her on my own because I'm really hurt. I fell off a 60ft cliff.  In turn, if I'm in too much pain to take commands, she curses at me and screams at me to where you can hear her outside of the house. It's madness. I don't know what to do, and I have no where else to go. Even if i did, I can't just leave her here alone, she will die.

A month or 2 ago, she fell out of bed, between the bed and the wall, and couldn't get up on her own at all. She fell at 3A.M., and I didn't find her untill 8A.M. When I woke up in the morning, she appeared drunk, had slurred speech, and it was so hard to get her off the ground. She's 175LBS, and I'm about 129LBS soaking wet, because of my muscle atrophy. It took me 30MINS to get her back into bed. I had to use boxes, and get her to kneel on each one like a step, till she got her stomach on the bed, and I was able to roll her unto the bed. A few days later, she goes hysterical because there are dirty dishes, and starts cussing at my 14-year-old daughter calling her vulgar names, because she didn't wash the dishes. She walks around all day talking to herself, cursing, and even "talking to God." She's become some kind of religious fanatic, but at the same time, very evil and angry full of hatred and violence. She has even hit me and pulled my hair when I pray for her. I don't know what else to do. All of my brothers have been gone 15-20 years and the whole family has pretty much disowned her. I'm the only person she has left. I feel bad thinking about putting her into a home, but I feel even worse about leaving her here alone. I don't think she can survive without me at this point, but she constantly abuses me and my daughter, physically and emotionally. She has fewer days of being her old self or civil as time progresses, and I'm afraid soon she will lose all coherence. Then she won't be able to sign over POA, which I don't know how to do. I just have authority over her insurance and setting up appointments, signings, and setting things up. What's worse is she keeps telling me to get a lawyer to form her will and turn all the crap over to me including the house, estate, and belongings upon her death, and I don't know how to do any of that, or want to, but it has to be done. If I wait any longer I'm afraid she will descend into madness and won't be able to make those decisions. What on earth do I do now? I can't even get her to go to her appointments, so nobody knows what's exactly wrong with her, or why her mental illness has been so heavily amplified the passed few months. She shows symptoms of seritonin syndrome, and has been on tramadol for years, which is actually an SSRI pain reliever with opioid properties that cause seritonin syndrome, along with nuerontin which can cause suicidal behavior, and tizanidine a power muscle relaxer. She often complains she wants to die, and has these fits of sobbing, and rage. She literally acts possessed and has even said she has hallucinations. She's always had mental problems of sorts, but lately it has become full on madness and rage. I can't take care of her if she won't cooperate. I'm in so much pain with 80%of my body shattered and reconstructed that I can barely care for me and my daughter alone, let alone an elderly mad woman who won't cooperate or be proactive in her own healthcare. I live in Texas, and heard the only way to put someone in placement is under there own consent, but she won't consent and she won't be civil towards the caregivers. She has put me in an impossible position.