October 5th is the National Day of Prayer for Mental Illness, Recovery, and Understanding.
St. Dymphna is the patron saint of those suffering from mental illness. This is a prayer asking for her intercession:
Good Saint Dymphna, great wonder-worker in every affliction of
mind and body, I humbly implore your powerful intercession with Jesus
through Mary, the Health of the Sick, in my present need. (Mention it.)
Saint Dymphna, martyr of purity, patroness of those who suffer with
nervous and mental afflictions, beloved child of Jesus and Mary, pray to
Them for me and obtain my request.
(Pray one Our Father, one Hail Mary and one Glory Be.)
Saint Dymphna, Virgin and Martyr, pray for us.