Doctors seldom have answers to health problems that are outside of their realm of training and experience.
Doctors are just auto mechanics that studied human repair, instead of car repair. How many bad mechanics are there? Many! How many bad, or ineffective doctors are there? Many!
Even the really good doctors struggle with illnesses that are not highly researched or documented.
So....... the end result is that doctors don't want to look less than experts, so in order to charge high rates, without doing much good for patients, the doctors blame the patients for their own illnesses by telling the patient that it is the patient's anxiety or stress that is causes the illness. What this does is robs the patient of any hopes of getting a cure for their misery, when, in many, many, MANY cases, it is the illness, or health problems, that cause the anxiety and stress and not the other way around!
Good luck at finding a doctor who has any credible experience or knowledge of chemical sensitivities.