vex
verb.
cause annoyance in; disturb, especially by minor irritations
Mosquitoes buzzing in my ear really bothers me|It irritates me that she never closes the door after she leaves
verb.
disturb the peace of mind of; afflict with mental agitation or distress
I cannot sleep--my daughter's health is worrying me
Synonym: worry
verb.
change the arrangement or position of
verb.
subject to prolonged examination, discussion, or deliberation
vex the subject of the death penalty
verb.
be a mystery or bewildering to
This beats me!|Got me--I don't know the answer!|a vexing problem|This question really stuck me