So I told him "I already know that because you're basically just reciting the very same web site I was looking at yesterday before going to the ER but I felt that I should see an actually doctor about it. So do you have any clue what could have caused the shock or should I just pay close attention to what I eat, drink etc just like it says on that web site and hope for the best that I find the food that I'm allergic to?"
He had no clue. Thank god for free healthcare (oh well, tax paid universal healthcare) in Sweden.