David/Jay:
Sometimes it means the priest must turn away the "possessed" subject to doctors, and sometimes the doctor must turn away the patient to a priest. We are talking not hypotheticals but of desperate situations where lives hang in the balance. Sometimes you have to take a step into something you neither believe in or understand to save a life.
One therapist documented in the following article, the likely reasons why psychological/psychiatric interventions fail when people have the psychiatric/psychological conditions mentioned in the OP:
http://www.somer.co.il/articles/1997Paranoarmal.dissoc.pdf:
Paranormal and dissociative experiences in Middle-Eastern Jews in Israel: diagnostic and treatment dilemmas by Eli Somer
(perhaps a fitting article given that you are also a Jew
)
According to the author:
God and spirits are thought to exert various influences on individuals in various cultures.
Therefore, instead of offering personal, intrapsychic explanations for one's distress - that is, explanations based on the INTERNAL psychological processes of the individual - people often tend to provide religious, social and cultural explanations for their experiences.
So some persons afflicted with the various conditions in the OP are not construing them as intrapsychic - that is, based on their INTERNAL psychological processes - but rather they perceive their condition as manifestations of external spiritist agents.
When patients construe their suffering in cultural idioms implicating supernatural experiences, some patients refuse to accept any of their possession-like experiences as possible manifestations of their own dissociated ego-states. It then becomes a struggle for doctors/mental health practitioners to find common ground on which significant help can be offered to such patients who are manifesting dissociative and other symptomatology.
Spirit possession is a universal phenomenon which is culturally shaped. Some patients perceive their illnesses through a cultural perspective rather than as manifestations of their own internal psychological processes. They believe in the spiritual essence of their condition and so use spiritist folklore-based idioms in their attempts to express and explain their suffering. They therefore may not see their distressing and unrelenting problems as a mental health matter. Some patients may feel that a culture-bound conceptual framework might better explain their pain/affliction/malady than a psychiatric one.
The idiom of spirits and possession are culturally constituted. This articulation might be used by some patients because of the relief these cultural constructions can offer to their protagonists. Such patients interpret all of their symptoms within this paradigm rendering them completely untreatable within an intrapsychic/clinical conceptual model.
They reject any information or interpretation of their symptoms as otherwise plausible, irrelevant to their own particular case. Their symptoms are framed in concepts that preclude any meaningful psychotherapeutic interventions. They are not willing to accept medical explanations for their conditions/afflictions. The conceptual framework for understanding their affliction is incompatible with conventional psychotherapeutic principles. This is the dilemma faced by both patient and therapist, the latter may find it difficult to bridge the cultural perspective gap when attempting to treat the patient.