I am sorry to hear your day went bad and we are here if you want to vent about your day.
I am severely allergic to Tetracycline and had an anaphylactic reaction - which came on with in a few minutes of taking the medication. You get a feeling of doom plus your body starts to react violently ad you know you need help ASAP.
If you experience itchiness or rash, swelling of the tongue and face, if are swelling enough that you are unable to breathe, your throat is closing in, wheezing like in asthma call 911 or get to the ER immediately.
I am not sure about food allergy reactions but agree with SC that checking in with the asthma/allergy forum would be a great idea.