Hi thank you for posting on HCM, I understand your concern, In hay fever it s difficult to find the exact allergen even after sophisticated allergen tests. However this is a very common chronic recurrent condition which can be controlled by antihistamine and anti allergies treatment. But if your kid gets very frequent attacks which disturb her usual life it s better to consult an immunologist who can asses the severity of symptoms and to start a long term prophylaxis treatment; also in the mean time he might do some important tests to find exact identifiable allergens for your kid. Her abdominal pain can be due to allergy induced enlarged lymph nodes in the tummy . Hope the answer is helpful. All the best.