I am so sorry OP, this sucks! For future knowledge, when you're in a pinch, common pantry items can bring some relief; apple cider vinegar, oatmeal (you can make a paste with water), and/or ice can help itching/hives/other skin reactions. Warm chamomile or peppermint tea (drop in an ice cube when needed quickly) can help internal reactions like nausea, diarrhea, itchy throat, etc. Obviously these are meant for milder reactions, don't futz around if it's a serious reaction.

Sorry to hear that man! I learned I'm allergic to tequila this way. Throat was swelling up and closing so I had to run into a populated area and scream if anyone had allergy meds. A few people offered me an epipen thank goodness. Now I always carry extras for anyone else who might be in need. (Came in handy once!) Pay it forward OP