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Treatment is determined case by case. Of course antihistamines are needed. H1 (Claritin, Allegra, Zyrtec, Etc) and H2 (Zantac,etc.) From there it depends on the severity of your symptoms.
In my medicine toolbox:
EPI Pen
IUD Birth Control for the Cardiac Symptoms
1 - Allegra/Day
1 - 2 - Zantac/Day
1 - Baby Aspirin
1 - Albuterol Rescue Inhaler
1 - Steroid Inhaler
Benadryl for emergencies