An employee at messed up the order. I asked politely if it could be corrected. Her back was to me and I received the correct order. When I began to eat it it tasted funny. Then I took it apart and the egg tasted like soap. It was a strong detergent taste like soapy. I threw up and my stomach has pains. I am going to the ER. I noticed the detergent immediately and I eat everything separately. So I pull apart the sandwich. I ate the sausage patty and picked at the biscuit. When I picked the egg it was very strong soapy detergent.