@nannybb My wife's attitude changes with the wind and just as quickly. I am her sole caregiver however, our son is nearby (less than a mile) and when necessary, will come over to calm her down.
She's had dementia about 12-14 years ( I can't remember exactly when she was first diagnosed). He neurologist stated that she is "end-stage", what ever that means. My wife is physically very healthy. She has a personal trainer one day a week and goes to the gym with me 3-4 times a week.