anaphalactic shock (sp?)

At 5:45 a.m. the morning after Thanksgiving, we woke up to Raegan looking like Will Smith in the movie Hitch after he had eaten shellfish... HUGELY swollen everywhere!! Also known as anaphalactic shock. Her eyes were completely swollen shut, her lips were about 20 times their usual size, and her ears were swollen and covered in a rash that also covered most of her body. We have no idea what caused it, but we are on a mission to find out starting tomorrow morning at 10 a.m. We are going to see a pediatric allergist and internist tomorrow. In the last 2 days, she has had some minor reactions like red patchy bumps around her lips to some of her normal foods and some new ones. I'm anxious to see what she actually is allergic to just so I can be more prepared and not scared every time I feed her something not made at home. Pray that we find out everything we need to know tomorrow so we don't have to go through this anymore!!