For the last two weeks, whenever I eat sugary junk food, it doesn't seem to agree with me at all. Whenever I eat sugary foods, I get a post nasal drip, I become congested, and I get a headache. I am talking about all types chocolates, candies, cookies, cake, etc. I have never been big on sweets and have never really eaten them habitually although I do enjoy them. It doesn't happen when I eat fruit, so I assume it must have to do with refined sugar? Thanks for the help.