Ilena Rose wrote:

Multiple Chemical Sensitivities
and Immune System Dysregulation
originally published as the Forword to A Consumer Guide for the
Chemically Sensitive (self-published by the authors) in 1982.

Much more reliable are peer-reviewed studies published
in reputable journals.

Psychother Psychosom Med Psychol. 2006 Mar-Apr;56(3-4):162-71.
[Psychiatric disorders of environmental outpatients--results
of the standardized psychiatric interview (CIDI) from the
German multi-center study on Multiple Chemical Sensitivity
(MCS)]
[Article in German]
Dietel A, Jordan L, Muhlinghaus T, Eikmann TF, Herr CE,
Nowak D, Pedrosa Gil F, Podoll K, Wiesmuller GA, Eis D.
Robert Koch-Institut, Fachgebiet 22/Umweltmedizin, Berlin.

BACKGROUND: A nationwide, environmental outpatient-based
multi-center two-phase study on Multiple Chemical
Sensitivity (MCS) was conducted from 1999 until 2004.
The aim of the study was to characterize more precisely
the health-complaints relevant for the MCS-phenomenon.
A standardized psychiatric interview (CIDI), used to
identify frequency, character and duration of psychiatric
disorders and their chronological relation to the
environment-related health complaints of the patients,
formed part of the extensive diagnostic procedure.

METHOD: 251 (86.3%) of the 291 attendees of the
environmental outpatient departments in Aachen, Berlin,
Bredstedt, Freiburg, Giessen and Munich, were examined
using the German version (M-CIDI/DIA-X) of the Composite
International Diagnostic Interview.

RESULTS: 83.7% (lifetime prevalence rate) fulfilled the
diagnostic criteria of at least one psychiatric disorder,
with the 12-month and 4-week prevalence rates being
76.5% and 64.5%, respectively. Environmental outpatients,
in all prevalence periods, had significantly higher rates
of psychiatric disorders than the comparable general
population. Somatoform disorders were most frequently
diagnosed, followed by depressive and phobic disorders.
For 81.2% of the patients the psychiatric disorder
started long before the environment-related health
complaints (average 17 years).

CONCLUSIONS: This study confirms the results of earlier
studies, i.e. that patients with environment-related
health complaints suffer from psychiatric disorders
more frequently than the general population. The high
environmental outpatients really suffer from
psychosomatic complaints, but attribute the causes to
the environment. Application of specific therapeutic
regimen is recommended for those patients, whose
psychiatric disorders are safeguarded diagnostically
and for whom a relevant exposure is unlikely.