If someone or something is ‘a flash in the pan’, it didn’t last long.
If you ‘jumped the gun’, you started too soon.
If you feel confused, you 'feel at sea' .
‘Zip it!’ means be quiet.
If someone ‘worked like a charm’, it went well.
The movie was 'run of the mill'.
I’m so tired, I need to recharge my batteries.
If you feel unwell, you can say ‘I feel under the weather‘.