Allergic Reaction! >.<

Until 2 days ago my skin was totally fine, and then I wake up and….there are red bubbles all over my face! It started yesterday, and today is even worse. I’m desperate and I would like to know if any of you know a way to calm allergic reactions down a little bit. Anything will help, since It never happened to me before I don’t know what I should do ;_;
Thanks!