Question: how to tell if you're having a severe allergic reaction?
Answer: Skin reactions, including hives and itching and flushed or pale skin.
Low blood pressure (hypotension)
Constriction of your airways and a swollen tongue or throat, which can cause wheezing and trouble breathing.
A weak and rapid pulse.
Nausea, vomiting or diarrhea.
Dizziness or fainting.