Hi.. Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand.. As per your complain it seems to be anaphylactic reaction or allergic reaction to some other allergen along with sulfa drugs and can be certain foods or other common allergen like pollen, animal danders, sea food etc.. As soon as you get exposed to any of the allergen the symptoms initiates.. You should consult an Allergist and get evaluated and a thorough clinical evaluation and allergic tests like antibody specific RAST test, Patch test and food challenge tests can help in diagnosis and treatment can be planned as per diagnosis.. In case of allergic reaction you will be advised anti-allergics/ anti-histamines like Levocetrizine or Allegra. You can also be given an Immunotherapy for reducing the severity of reaction.. Hope this information helps.. Thanks and regards. Dr.Honey Nandwani Arora.