When you dream of being allergic to something, it means there are some kind of circumstances which makes you feel emotional. You should consider if there are things you don’t like doing, maybe it is very enervating and hard and if you feel that way, then you should stop doing it, even if it will cause serious damage to others. You can not be responsible for the others, you have to look after yourself. Maybe you should take a short break, relax and think of what has to be changed.
Read more about dreaming of Allergy in other dream meanings interpretations.