Вот несколько интересных идиом, широко распространенных в Канаде и США, которые используются чтобы описать состояния здоровья:

"I'm feeling under the weather today."
В случае депрессии используется
'feeling down or feeling blue'

Feeling healthy: right as rain; in the pink
Feeling sick: green around the gills

down in the dumpsб out of sorts
1) Sick as a dog
2) "Bummed out", but this is pretty informal ;o)

Обратите внимание:

"You look like death warmed over. " Informal, generally only said to a friend or close collegue. Generally said with a concerned tone of voice.

"Look what the cat drug in." Very informal, said only to close friend or family. Implies that the person addressed looks like a dead animal brought in by the family pet cat. Often used to describe someone who is suffering from self-inflicted illness, ie. a hangover.



You can also be "hit hard" by a virus (really sick), "freaked out" by recent events (shocked, worried and saddened), and "spinning your wheels" on a current project (getting nowhere).