be in low spirits
To be unhappy or sad, often due to being discouraged. Ellen's been in low spirits ever since she found out she didn't get the lead in the school play.
be in high/low ˈspirits
(also in good/poor ˈspirits) be happy and cheerful/sad and miserable: John was in rather low spirits all evening. ▶ ˌhigh-ˈspirited, ˌlow-ˈspirited adj.: high-spirited children