Are allergies/anaphylactic reactions classed as a disability?

Not usually. Unless something interferes with your ability to perform normal activities or perform employment, you are not considered disabled. Severe asthma is probably one of the few conditions associated with "allergies" but allergies or anaphylaxis are usually not considered a disability.

Related Questions

What type of allergy makes the most childhood anaphylactic reactions?

Peanuts. Food is the most common trigger of anaphylaxis in children, especially peanuts and tree nuts. Other foods include shellfish, fish, milk, eggs, soy and sesame. Read more...
Food allergies. Food allergens are the most common causes of childhood anaphylactic reactions with peanuts, tree nuts, fish, shellfish, cow's milk, soy and eggs being among the most common. Stinging insects, medications and latex rubber are also among the more common causes. Read more...