Oh goodness, I am so sorry about all of this. I can understand how completely overwhelming this is for you. I wish I could come up there and help you.
I have a family member who also has delusions and sometimes I find that it helps calm him if I just kind of answer him in creative ways even if it makes no actual sense. I also took care of a Parkinson's patient who sometimes said delusional things and I found that that same creative response technique worked for him as well. For example, if she asks for an electrician, I might tell her that the electrician will come shortly and then tell her later that he came while she was sleeping. I might even go so far as to ask a nurse or an orderly if they could even come in for a minute with a clipboard and pretend to be the electrician and pretend to take notes on the things to fix. Sometimes, in a desperate situation, playing to the illusion helps because the person will calm down.
My aged father was also in the hospital for emergency surgery, he just came home yesterday after being there for three weeks. When I was visiting him at the hospital two weeks ago, he also had an hallucination. He told me about it and I just asked him if the person he saw was someone he knew. He said it wasn't. I would never deny that his experience was real nor would I challenge it in any way because whether it was real or not, in that moment, it was very real to him. I just told him that perhaps it was the spirit of an ancestor who had come by to see him. I believe that that sort of thing can absolutely happen. But the point is that even when my friend with Parkinson's was having his big delusions, I did not fight him about them and that seemed to really calm him. Maybe if your mom feels like whatever she is seeing is being validated, maybe it will calm her. It's worth try.
I am sending you lots of love and thoughts of strength and courage. Make sure you get as much rest and good nutirition as you can. Great big hug.
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"I'm bad and that's good. I'll never be good and that's not bad. There's no one I'd rather be than me."
Wreck It Ralph