Under the weather is a polite way of saying hung over (which I am not) or starting to get sick (which I so am).
In Los Angeles when you feel like crap with a capital C, and you have to go to work for various reasons, you get in your car, go to work, do what you have to and either go home or drive to the beach and sleep until you can go home.
In New York when you feel like crap with a capital C, you get on the subway - sick, and feeling disgusting . Then you get to your stop - finally, after the subway has shaken - not stirred - your insides until they are DYING for the comfort of the Citibank Men's Room - only to find that the escalator's are out and you are trudging up the lifeless hulks like you are on the Bataan Death March. (run on sentence much). And you get to your office (after a not so quick stop at said Men's Room) to find that the summer air conditioning is still on and your nipples can now cut glass.
Charming.