Below are some fiction books where the characters are dealing with mental health issues.
The goldfish boy by Lisa Thomson (OCD); Thirteen reasons why by Jay Asher (suicide); Are we all lemmings and snowflakes by Holly Bourne (mental health)
Turtles all the way down by John Green (anxiety); All the bright places by Jennifer Niven (bereavement & depression); The unlikely hero of room 13B by Teresa Toten (OCD).
The worry website by Jaqueline Wilson (anxiety); Running on empty by S.S. Durrant (bereavement & anxiety); Wintergirls by Laurie Halse Anderson (anorexia).
