There are probably more cases like this in the world than anyone realizes but there is not much literature to guide us here. This may be a symptom complex that is basically a stress relief, and it will go no further, but be an expression of an underlying stress. I would be on the safe side and have a very experienced doctor, probably one from a university hospital, make an evaluation. There is probably no hurry, but would be wise to do when you can. Just be careful of not being over-diagnosed and given medications that you don't need. if that seems to happen, get a second opinion.
Hallucinations are an organic disturbance for which there are a lot of reasons, meanwhile the criteria for recovery from "schizophrenia" is the ability to make and maintain friendships, support family, and pay income tax (or do well in school). If that is true it doesn't seem that your husband would be in danger of being diagnosed "schizophrenic". You probably just want to make sure that he is not having delusional thoughts and becoming "schizophrenic". I don't think you have anything to worry about unless your husband was a former drug user, and that would depend on the extent and type of drug used. One other possible cause of hallucinations is sleep deprivation. Sleeping pills and certain psychiatric medications can mimic sleep deprivation by interupting the dream cycle, and therefore cause hallucinations.
If the hallucinations were disturbing him, I think he would see a psychologist on his own.
As for L Ron Hubbard's specific detoxification method...I believe the studies he references are valid. I don't know about the science fiction. I don't know what you are talking about, but Narconon International, www.narconon.org talks about his method and how it helps people, so it must be somewhat reasonable. It's something people should know about so they can take responsibility for their health.
From Narconon:
"While drugs and their metabolites quickly become undetectable
in blood and urine, some as rapidly as 3 days after last usage,
drug metabolites remain stored in fatty tissues for years. That accumulated drug residues continue to cause adverse symptoms led L. Ron Hubbard to develop a program aimed at reducing levels of toxins in the body to assist in recovery."
"As a doctor it was evident to me that the long-term physical, mental and emotional consequences of drug use had something to do with the residual effects of the drugs themselves." Dr. Meagan Shields
http://www.narconon.org/narconon_studies02.htm
http://www.narconon.org/narconon_detox.htm