Your son has definitely had a severe allergic reaction known as angioedema and urticaria. Of concern is the fact that even after he was given treatment in the emergency room he vomited and still has swollen lips. He does need to be on a course of cortisone. I would prefer him to be taking a more effective antihistamine such as Zyrtec or Allecet tablets 10mg once daily instead of the Phenergan.Your son should be regarded as being allergic to Buscopan and Atropine. This is a common and potentially serious allergy. He must not have Buscopan in any form again and if he ever needs an operation the anaesthetist should be informed that your son is allergic to Atropine. He must get a Medic Alert disc.
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