From Charity for the Suffering Souls by Fr. John Nageleisen (imprimatur 1895), it says, The book also says that the Holy Souls have spiritual torments that consist of separation from the beatific vision of God (“the supreme, the most excruciating pain that the soul can endure”) and the consciousness of the fact that it is by their own fault through sin that they are deprived of the beatific vision, which fills them with sorrow. The location of Purgatory is said to be in the earth and very near to Hell, and it is believed that demons torment the Holy Souls.
However, the Holy Souls also have consolations in Purgatory that are not present in Hell. They are assured of their salvation and are more conscious of themselves being beloved children of God than the holiest of the saints were on earth. They also receive consolations from prayers and visits from the Blessed Virgin. These consolations, like the sufferings they endure, exceed what we can experience on earth.