Well I finally tested for corn. It takes two weeks to get offending foods out of your system. It also gives you two weeks to decide what to test with. I settled on generic Corn Chex with soy milk. Sure enough. I had a reaction. Unlike the other foods I tested it seemed to be fairly mild. The reaction (stomach pain and nausea) only lasted about 15 minutes. So I am corn positive, but mildly so. Maybe some further exploring this corn thing is in order. I will be REALLY sad if I have to give up my popcorn. Sniff.