Multiple Chemical Sensitivity is a complex condition. Toxins are the direct cause but as either cause of effect many systems and organs in the body are affected.
The brain, the nervous system, digestion, adrenal glands and the detox organs like the liver, kidneys, skin and lungs are affected.
Detoxing is a must, but only beginning. Many people are healing their MCS these days. It takes time but can be accomplished. I suggest reading and getting as much information as possible about foods, healing modalities and toxins in our food and environment.
It may take some time, but after a while you will know so many ways to live, be healthy and happy in our modern environment and probably avoid so many other illnesses.