My two cents: Take the mental health days when you need them. My co-teacher when I taught at Head Start was a lovely woman in her early sixties. Never liked to even take a sick day. Worried about how they'd replace her for the day, because, subs are hard to find. Well. Her cancer returned and she never got to retire. Never got a chance to do all that fun stuff after retirement. At the end of our life, no one ever says, "Gosh. If only I'd gone to work more." Spend the time with loved ones. Take that trip. Make memories. Go to that festival. Carpe diem.