If you are watching a movie, and the character does something very scary like parachute out of a plane, can you say "I'm worried for her" "I'm afraid for her" "I'm stressed out for her even though I'm in front of my screen."
There are several questions here. I wouldn't call these idioms. "To fear" has a transitive and an intransitive meaning. I fear that tiger. I am afraid of that tiger. I fear for my life. I am afraid for my life. My wife is driving alone in a storm. I'm afraid for her.
Movies are supposed to turn on your emotions. A really scary movie can make you fo