So you had a moderate to severe allergic reaction
and even though you mention at the start you have no food allergies - which usually means 'never' - you say you had egg allergy
You definitely need skin prick test against the common food panel - peanut, cashewnut (if you had a reaction), fish (sardine/cod), shrimp, crab, lobster and aeroallergen such as house dust mite.
Or a specific IgE blood test
against the above to understand why you reacted.
You can get over egg allergy (at least 75%-80% do by age 5 years), but you retain the susceptibility of 'food allergy' only to become allergic to a specific food later.
You must keep an anaphylaxis
kit with cetirizine
, epipen, steroids and dial the emergency number if you get in trouble again.