Mess with (one's) head American informal verb phrase
To cause someone to feel confused, worried, or upset
What she said messed with my head.
The government has just introduced a policy that is messing with the residents' heads.
be confused about what to do
To be very anxious
Being so scared, confused, and astonished that you can't think or do anything.
Unsure or confused.
To feel that unpleasant or dangerous things likely happen to you
The verb "mess" should be conjugated according to its tense.
A humorous way of saying that what one has said is just what they acknowledge and may not be entirely accurate
Mike: Have you returned from your vacation on the beach? Your skin seems to get tanned.
Jenny: My skin is always dark. That's my story and I'm sticking to it!