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How do you say "not yourself" in English?

I. "Non-ego" English:

1. If I mean myself, it should be: not me. Or not myself.

It's not him/her. It's not him/her.

Secondly, I [běn rén] explained it in detail.

1. self[ self]

Self, self; Essence; selfish

2. yourself [w? Self]

Pronoun himself; As far as I am concerned.

3. The flesh is alive and lifelike; Personal, personal

4. Go in person. In appearance; oneself