I have discovered that Saint Gertrude is another patron saint of those suffering from Mental Illness.
Saint Gertrude the great was a Benedictine and mystic writer, born in Germany, 6 Jan., 1256. She died at Helfta, near Eisleben, Saxony, 17 November, 1301 or 1302. Her inner struggle centered around her sensitive and impetuous nature.
St. Gertrude the Great is invoked for souls in purgatory and for living sinners. She had a devotion to the Sacred Heart and to praying for the Souls in purgatory. Our Lord told St. Gertrude that the following prayer (see post below)would release 1000 souls from purgatory each time it is said. The prayer was extended to include living sinners as well.