My chemical sensitivity

I have tried to highlight this as bullet points for easy reading.

• I've always been sensitive to certain toxic chemicals right from the day I was born, unlike those whose sensitivity seems to have been triggered by excessive exposure.
• Not all fragrances will give me a headache, but most toxic chemical smells do, and most naturally occurring fragrances don't.  Chemical toxins do not even have to have a fragrance to trigger a reaction to them.  
• My reactions vary from a slight headache to migrane like symptoms, nausea, and serious fatigue where I will need to sleep constantly for 12 or more hours.  Certain toxins like cigarette smoke cause a reaction similar to that of hayfever alongside headaches and nausea.
• Some of my reactions are immediate and others are triggered after prolongued exposure such as sitting by someone wearing perfume for 20 mins or more, other reactions are comletely delayed and occur several hours after I have been expose to a toxin.  Identifying the cause of these reactions if often difficult. 
• I have good days and bad days.  On a good day I can work in my office where people wear perfumed deoderant and only have a slight headache.  On a bad day walking down the cleaning isle of the supermarket will put me in bed for the rest of the day feeling sick with a headache.  The more constant exposure I have the worse my reactions seem to be.  Good days are usually Mondays when I have had a toxin free weekend to recover.
• I also have many allergies to things that are naturally occuring, such as pollen, dust, pet dander, milk (inc. cow, sheep, goat), chicken, eggs.