Answer:
Obsessive- Compulsive Disorder (OCD).
Explanation:
OCD is a type of anxiety disorder, characterized by an obsessive behavior and general stress, fear and anxiety. It is followed by the compulsion, the need, to carry out ritualistic and repetitive behaviors as a way to control one's environment.
There is a general obsessive-compulsive cycle, in which the obsession begins and is followed by the compulsive behavior such as turning the light on and off three times in order to control the obsession, for example.