I noticed strong headaches when eating food containing calcium chloride. I am very sensitive to all chemicals in food. Including sulphur and MSG etc. But I was surprised to find Calcium chloride in "Health Foods". I there an antidote drug - when I eat calcium chloride containing food I get headaches 12 hours after which last some 12 to 18 hours. Any Tylenol or Advil drug does not help. Actually nothing helps ..except waiting 18 hours to go away. How many people have such headches whithout knowing the cause?