Dream about having severe allergic reaction is sadly an aspect of yourself that is not working or functioning as well as it should. You are feeling low and sad. You are not being open to a situation. It signals your character flaws. A relationship will not last long.
Having severe allergic reaction dream is a message for of emotional or relationship problems. You are unable to be your true self. You always look at the positives of even a bad situation. It means infidelity, either by you or someone else. You are not facing reality.
If you dreamt about having severe allergic reaction:
You are generally no stranger to suffering. Your quiet, internal world is constantly interrupted and disturbed by the goings-on of the human race. In order to keep your equilibrium, you must have one or two hobbies that strengthen your inner world. Painting comes to mind, or playing some kind of music. Knowing the kind of atmosphere you thrive in is paramount. Give yourself what you need in order to feel secure in your environment.