They don't have a realm, they aren't spatial or dimensional, they don't even have being whether it be what people call "spiritual" or physical. Any seizures caused by them are not a result of epilepsy and even though they can cause psychotic behavior it shouldn't be confused with schizophrenia. Like what was said before, a resounding slap can cure a patient, sometimes the talking cure is needed to cure a patient, sometimes a mixture of drugs and therapy will help, if none of that works, maybe ritualized therapy is needed as well as spiritual counseling but some are so powerful that there is nothing you can do about them at all.