Hi I believe that "under the weather" is an old sailor phrase. When men were sick, they would rest below deck and thus were literally "under" the weather on deck. 'I am not well' means you are not comfortable as you used to be normally.
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khoff"Maybe I'm coming down with a cold or the flu, but it's not clear yet. I just know I feel lousy."Can I use 'sick' and 'not well' to describe the situation in the quote?