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My cousin has Vascular Dementia mixed with AD and she had symptoms that came upon her pretty quickly. She had more anxiety/confusion/hallucinations though and not anger. I was told by the AL staff that often PAIN can manifest itself in their behavior. Maybe he can't tell you, but perhaps he does have pain. Has he had a fall? Does he have arthritis? What about dental problems or an ear ache? I'd have him checked out physically and see if the doctor will okay giving him something for pain like Tylenol just to see if it helps him feel better. If it's pain, then he may get relief and you'll know that's what it is. Of course, then you have to find the cause of the pain.
Just some things to think about, and perhaps sharing more info would help the forum come up with ideas.