Idiom
be in the doldrums
1.
if a business, an economy or a person's job is in the doldrums, it is not very successful and nothing new is happening in it.
High-street spending remains in the doldrums and retailers do not expect an imminent recovery.
2.
to feel sad and to lack the energy to do anything.
He's been in the doldrums these past couple of weeks and nothing I do seems to cheer him up.