This was my experience this week. After the wedding, I was tired. Family time, travel time, questionable eating, etc... left me in the tank for a couple days.
The reset button has been pushed and things have changed.
For athletes, it is essential to not let a couple bad workouts send the head in a downward spiral. I am sure it is the same for parents who have a couple bad days with the kids or for married couples or for managers in the business world or, really, for anyone. Negative feelings can snowball and the only person who can reverse that attitude is the owner of that attitude. (the legs will come around... the head is the controllable part)
So, find your reset button! (mine came in the fashion of a sleeping aid, a couple really big meals, and some friends)