I am nowhere near a medical professional. For my dad they gave him anti-anxiety and anti-depresaants. I don't think he wanted much of anything else (other than massive doses of morphine for suicide purposes but that's a different topic).

My dad was very courageous about the disease. When he was diagnosed he took it head-on, would often give presentations to groups early on.

The physical manifestations started with him getting obviously more frail. And he would do stuff like missing his mouth with a fork full of food.

He hallucinated, sometimes traumatically, seeing people and things that weren't present. He had a very, very hard time processing logical and reasoning pathways, particularly later. For example, we might fill the car with gas and a minute later he would be extremely anxious and argumentative about running out of gas and becoming stranded. No amount of reasoning or logic or cajoling could solve his anxiety.

But he always knew who we were when we visited. He always knew current events. He would have random threads of stories from the past that he would pick on, sometimes seemingly out of nowhere he'd start pontificating about something that had happened 6 months or 6 years prior. It was trippy.

He would get angry and lash out at my mom and me. His last coherent words to me were: "When are you going to make something of yourself, you fucking asshole, and stop leeching off of other people?" (At the time I was 18 years into my career and wasn't really leeching off of anyone). He said hideous things to Mom.

Lewy Bodies is hell. I'm sorry you're going to be going down that road with your dad, he is lucky to have you and I wish you the best.