Take B vitamins(most vitamin stores sell what is referred to as B50, 50mg of each of the B vitamins). You could take half a B50 tablet 2-4 times a day. Vitamin c is very important. 500mg or 1,000 mg 2-4 times a day of buffered vitamin c(calcium or magnesium ascorbate?) would be good. Magnesium citrate 200-400 mg of magnesium each day. Zinc 30 mg a day would be a good idea. If you don't get much calcium in your diet, then you might also want to take a calcium citrate supplement. There are many other supplements you can take. These are just the basic ones.

Molybdenum might help reduce the chemical sensitivity. Some people take 500 mcg- 1 mg a day.