Wow! How scary! I don't have any suggestions as I'm in the US.
One of my best friends suddenly developed a shellfish allergy in adulthood. On my wedding day (she was in the party) she ended up in the ER after eating shellfish. I was very shocked since I've dine with her on plenty of other occasions and shellfish was never a problem until that day. She now carries an epi pen.
Both my brother and I developed a nut allergy around age 7 and 9. We were pretty much allergic to any types of nuts (peanuts, cashews, walnuts, etc).