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Welcome to JustAnswer Health...and thank you for your question. I am a verified Expert and am delighted to help you today. To be very frank.. this does not sound like an allergic reaction at all. Your vital signs were all within normal limits... and the labored breathing can be explained by anxiety..... worrying that you may have been having a reaction from the medication. There is no danger that now, 5 days later, any reaction would now occur.
What could have caused the Hives to appear then? My only theory is I ate a Klondike bar and 15 minutes later the hives appeared.
However I have never had an allergy to chocolate or vanilla
By the way I was concerned that I was having a reaction to the medication