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Not feeling physically or mentally well, as in
I think there's something wrong; he's not himself
She seemed to be improving last week, but she's just not feeling herself today
. Also see
feel like oneself
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Nearby words for not oneself
not much to look at
not my cup of tea
not on your life
not one iota
not one's day, this is
not open one's mouth
not play for someone
not put it past someone
not put something past someone