It is possible to come back and do well for the remaining decisions in the day. Throwing all caution to the wind after a bad decision would be like getting a tiny spot on your white shirt, and then just taking a sharpie marker and marking up all the rest of it.
Why do that? It might have just come out in the wash with a little extra attention to it -- right?
Salvaging the rest of the day might just take a bit more exercise, or some extra attention.
Don't ever give up!