Fluctuating moods, and energy levels

Hello my fellow caregivers,
My husband was diagnosed with vascular dementia last year and it seems like I’ve been on a roller coaster ever since. First the mood swings, one day he will ask me for help, but then when I offer he has a meltdown saying he doesn’t need my help. I can ask a simple question like when he walks in the room and I ask him what’s you doing, or what’s up and he loses his temper. Next day he is giving me his complete Itinerary for the day.
For a couple of weeks he will do nothing, stay in his pj’s all day and sleep, then all of the sudden he’s fine out working in the yard. Hoping someone can tell me if this is normal behavior ( well nothing about this is normal 😢) and should I just go with the Fluctuations? I feel like I have to walk on eggshells all the time ☹️