Ignaz Semmelweis saved the lives of thousands of women decades before Lister discovered the role of germs in disease. In fact, contrary to how it's taught in most science courses, infection was a known cause of disease and death centuries before Lister identified the role of germs.
A 1980 Psychiatric Journal of the University of Ottawa mentions literature and clinical experience with the behavioral sequelea of sensitivities back to 1700.
In 1985, Eugene Garfield, PhD, President & Founding Editor of The Scientist provided an excellent overview of medical literature about sensitivities. Garfield documents several approaches, as described in scientific and medical literature before the discussion was subsumed under debate about the approaches of doctors of environmental medicine.