Recurring ALLERGY. A cure/end to this?

I have been trying all possible methods to treat my allergy since 5 months. No use. Tried ayurvedic and allopathic both. Can it even be cured? My symptoms keep recurring if I stop medicines. The major symptoms I have : dry nose, wet nose sometimes, blocked nose, itchy throat, little cough, sneezing, runny nose, loss of smell. Initially it starts with with sneezing, and blocked nose. Like cannot breathe properly. Then slowly others symptoms start showing. After 3-4 days of this I loose smell. When I took allopathic treatment symptoms disappeared. Nose got unblocked, hard / smelly mucus fell out and I started smelling again. But again after a week symptoms show up and same continues. Fed up now of medicines. Is there a cure/end to this?