I am trying to find out if it is possible to only be allergic to a certain kind of shrimp. I recently had a very bad reaction after eating shrimp at a japanese hibachi restaurant. I have had two reactions in the past (only at this restaurant) where I had itching and then hives. This time, I had intensse itching, then swelling in my neck, face, throat, shoulder area and armpits. I went to the ER and was treated as mentioned above. The strange thing is that I have eaten shrimp at home, and on vacation and haven't had a problem. I was also tested for shrimp allergy by my doctor (after the first two mild reactions) and it came back negative.
Is it possible to only be allergic to their shrimp or should I be looking for a possible spice allergy? I have no other problems with any other food.