not feel yourself

not feel (oneself)

To not feel physically or mentally well; to not feel as one normally should. I'm sorry for getting upset at you earlier. I just don't feel myself today. I know Mary hasn't felt herself ever since her cousin died.
See also: feel, not
Farlex Dictionary of Idioms.

not feel yourˈself

not feel as healthy, happy, etc. as you usually feel: I don’t feel myself this morning; I think I’ll stay at home.
See also: feel, not
Farlex Partner Idioms Dictionary
See also:
  • not feel (oneself)
  • not feeling oneself
  • not feel like (oneself)
  • feel (like) (oneself)
  • feel out of place
  • ace
  • ace (something)
  • an ace
  • feel bad about (something)
  • feel (some emotion) about (someone or something)