though your query was not in Ayurveda section but even then i am replying to this. As i am an Ayurveda expert so have dealt many chronic allergic patients with very good results.
In Ayurveda we do not simply treat the disease but we treat the patient as a whole so the cure rate is much higher.Ayurvedic medicines are without any side effects its Rasayan drugs boost the immunity so avoiding the allergy
attacks in the future also.
I think you must think of such harmless Alternative medicines,if you really looking a cure.
Wish you a very good health soon.Bless you.