A mentor of mine had pointed out on more than one occasion that having ups and downs isn't a healthy way to live. Instead, my mood should be somewhere in the middle.
Ups: Moments of intense joy and euphoria. Can also include excitement over things that have happened, are happening or are to come.
Downs: Having a hard time breathing as I feel like the world has come to an end. Worrying that seems to have no end in sight. In the end, I catastrophize a lot.
Okay. That means that Gerard Passannante's book Catastrophizing: Materialism and the Making of Disaster is worth rereading to at least understand better the downs of existing, but since my mentor used to have those ups and downs, thinking about her is a helpful way to head towards steady ground.