Hi I've Got An Allergic Reaction To An Uknown Allergen

Hi I've got an allergic reaction to an uknown allergen as such but have been told that NSAIDS might be a trigger however I still have swelling of the face and hives on my body even though I am not taking any medication with the NSAIDS apart from a migraine relief which the doctors assured me would be ok. Any ideas as I've had this since I was 11, but because it doesn't affect my throat nothing else can be done. Thanks