Homesick

Are everyone around him psychos or is it him

A man's carefully constructed life of "efficient" routine, work, eat, sleep.
shatters when his psychological coping mechanisms finally fail. As his mental walls crumble, his mundane office environment transforms into a visceral, sensory warzone where every repressed emotion becomes an explosion, and every social interaction is a casualty. It is a descent into a psychic landscape where the only sanctuary left is the familiar misery he once tried to escape.

How did he get homesick if this is his life? Maybe it is easier than you think