Continuous cough from more than a 2 yrs.

I have a cough problem (dry cough) and its from more than 2 yrs now. I have done several treatments, got admitted to the hospital consulting chest physician, had different antibiotics as a medication but still the cough is not gone. After taking medicine it gets fine for 2 to 3 days but again I start getting the cough. I also had allergy test but the allergy shown does not seems to trigger my cough because the food allergy mentioned is already been left by me a long back. Dust Allergy can be a issue but then i also get cough even when i am with my mask on inside my house as well. I always feel some kind of irritation in my throat which make me cough. It feels like mucus is stuck in my throat and i feel to clear my throat again n again. Attaching latest treatment and medical reports. ALLERGY REPORT: Mid high allergy of Milk, Cheese, Tomato, Capsicum, Dog Danger, Housedustand Curd. High allergy of housedustmite Mild allergy of perfume and brufen