Unsane (2018)

Heroin's main character, a girl named Sawyer Valentini, suffers from the obsession that someone is following her. Otherwise, he is an absolutely normal person and can even be called successful. However, the persecutor had made Sawyer so much that he had to move to another city and even seek advice in a psychological clinic. From now on, the hero begins real trouble. She becomes a true hostage to a psychiatric hospital and does not understand what you think and what - not.