With relation to the use of medications, Solomon describes in the The Noonday Demon the current, ongoing debate about the natural or authentic self. He says this is not new, but an age-old debate:
The following psalms taken from the Tanakh: The Holy Scriptures can be helpful examples for prayer and meditation during and after depression.
Ich liebe meines Wesens Dunkelstunden
Dich wundert nicht des Sturmes Wucht
Read Robert Giroux's complete introduction to Flannery O'Connor's collection of short stories. Elie notes that it's possibly the best opening to a book he's ever read.
His state of mind after the attempt on Hitler's life had failed.