My father just passes, he was 96 and had a full rich life, including 60 years with my mother, who has moderate dementia. She knows he is gone and is depressed but she also starts confusing him with her long dead parents and gets very agitated. She also starts lashing out at the caregivers who come to our home. She is taking an anti-depressant and a mild sedative at night, because she was not sleeping at night, at least since my father went into the hospital for a fall two weeks before he died. How can I help her?