How much is too much?

So its been one of those weeks.

I do a lot of respite care and general home upkeep. So I rarely go out or have an agenda of my own at times. I find myself emotionally exhausted, and generally, just burnt out from it all. Some days, I can't find the right words, and I even lose my thoughts mid-sentence. I find it hard to focus on anything for too long, and sometimes, I can't remember what I had made for lunch the day before.

There are moments too, when I'm looking for something (such as a water glass, a particular vegetable, etc) and I may pass over it several times before I realize that its there. I'm beginning to fear for my well-being and mental health, and I wonder if there is anything I can do to improve this setting.

I'm doing it for family, but I wonder, how much is too much? When should I stop, when should I put it off, and when should I jump in to help? Again, I'm providing respite care for a family member, and he is high functioning. Is there any advice, suggestions to mentally recharge, have a mentally-healthier setting, or even if I should still be there, but not as much? Any sort of feedback will be appreciated.

Toki