How do you deal with a parent who has dementia that is mean and won’t listen at all?

My dad is being verbally mean to me almost every time I go see him and when I call him. I know he doesn't know what he is doing but it still hurts. He also has sundown syndrome which has been really bad this week. Calling me every night saying he is dying. He is currently at a physical therapy place because of a recent fall. He is very paranoid saying they are watching him, to he has cameras in his room, to calling me telling me that they are killing him. Trying to get him back on some anxiety meds he stopped taking but it is taking forever at this place. I just don’t know what to do to help anymore. He has been homeless because he won’t listen to anyone. Goes out and spends all his money right when he gets his social security check. I have been talking to APS but they work really slow. Just hope they can help me. It’s really stressful.