I am my youngest brothers caregiver. He is on long term care. He is resisting my care and Dr.'s care. He's fired me. And has gone next door.

It seems he lives with you. Now that he's voluntarily left, change the locks so he can't come back in. Take pictures of his disgusting rooms. Video his behaviors. Call 911 when he's being verbally or physially abusive (or threatening it). Tell the responders he is resisting care and you are afraid for your life. They will hopefully take him to the ER and do a social admit (or Baker Act him). A problem is that your home is his legal residence so you will need to evict him to get him permanently out, if APS/social services don't get him into a facility. What is "next door"? Who is next door? Family, friend, neighbor? They won't host him for long so you need to act fast... "In a hospital, a 'social admit' refers to an admission where the primary reason for hospitalization is not related to a medical or health condition, but rather to address social factors like homelessness, lack of housing, or the need for shelter. Essentially, it's a hospitalization driven by non-medical needs, often involving patients who lack the resources to manage their situation outside of a hospital setting." "To 'Baker Act' someone means to have them involuntarily committed to a mental health facility .... This act allows for emergency services and temporary detention for individuals who may be mentally ill and pose a threat to themselves or others. "

Yes, call APS and let them and the state take over his care from here on out.
And get a restraining order against him if necessary.

Change your locks. Get help from an agency, such as APS. Do not talk to him. Block his number on your phone. Get a protective order from the police and if he violates it, call them immediately.

He's mentally ill and out of control, as you've observed. You must take this seriously and protect yourself. Otherwise you risk attack, injury, and becoming a statistic on the evening news.

I'm glad you've realized that he's not okay, and I wish you luck.

Seems the the Marchman's Act is voluntary so that will not work with your brother.

«The Marchman Act provides for voluntary admissions and involuntary assessment, stabilization, and treatment of adults and youth who are severely impaired due to substance abuse."

Is he in your home now? If not, do not allow him back in. If he comes back call the police and tell them you are afraid of him and he needs to be baker acted. If this happens refuse to take him back. Tell the Social Worker that the State will need to take over his care, you can no longer do it. He is out of control.

Call APS now and tell them he has fired you, that you can no longer have him in your house, that at 71 you can no longer care for him. He needs help you cannot give.