How do you react to your seafood allergy?

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I just found out I even had one! I love oysters but since theres no places around where we live to have them I usually have them very sparingly. But I have been traveling to Baltimore the past couple days (I think im falling in love with it) and on both days I had a bunch of oysters. The first day when I was coming home I didn't think anything of it because it was just my neck itching and I knew it was a rash but still thought nothing about it. By the second night about a couple hours after our dinner I started breaking out in hives. I got welts on both my shoulders, all along the side of my body, neck, arms chest and it kind of scared me because I never broke out that much from anything. Now the third day I STILL have the welts and its spread to my FACE!! I went to the gym this afternoon and when I came home I had another scare because I didn't notice it had spread onto my face until I saw welts on both sides of my face and embarassed because people must of been wondering whats up. Im going back to the gym in the next hour, any remedies to diminish these awful red welts anybody? Tell me how your body reacts to seafood, I have only had this reaction to oysters and I thought it strange because Mussels I also love and their body considered Mollusk but I have not had any reaction to them. I love seafood and that is primarily the meat that I eat but now I think Im gonna get tested to be sure.