Your group of symptoms sound like a chemical sensitivity to some food, food additive, or environmental chemicals. I get all those symptoms in the presence of diesel fumes, perfumes, or pesticides. And the symptoms are worse when I eat grains, dairy or soy, or when pollen counts are high.

You may want to check out Theron Randolph's book: An Alternative Approach to Allergies - the new field of clinical ecology unravels environmental causes of mental & physical ills.