Ummm, how about the possibility that this man (described in the web link) was actually energetically connected to a place where he was receiving information in the form of these hallucinations?
Or perhaps it was a part of him trying to communicate with him in an obtrusive manner?
If someone is doing spiritual practices and they start having hallucinations ... there might be a chance that something pretty amazing is going on. If it isn't interfering with your life in a threatening manner, maybe trying to "cure" it isn't the best thing.
I'm reminded here of the story about Milton Erickosn and the person who had psychotic episodes. He taught the person to go into deep trance and have the episodes in time distortion, so only a few minutes would go by. He then gave the person the option to take the episodes and mail them to him in envelopes. Very creative and respectful approach.