I know that I have a severe soy allergy. Last night, several hours after eating at a friend s house, I went to bed and had what felt like a severe onset of heartburn. Unable to sleep, I got up, and it got much worse - I had a severe headache, pain in my chest, my throat felt very tight, my jaw was aching. Allergy medicine did not help, nor did antacids. I wonder if that was some form of anaphalaxis (sp)? I had a similar attack (much less severe a couple of weeks ago). Just wonder what I should do if that happens again.