Hi.
The reason for your episodic coughing continuously during a typical time frame is due to the following reasons: It looks you are suffering from
Allergic cough : I would suggest the following.
CT scan of the Sinuses and Chest to 'rule out' any underlying problem as a primary cause or as aftereffect / sequel of the allergy as you have a problem of more than a year.
In consultation with your Doctor / ENT Surgeon.
Tapering dose of oral steroids like
deflazacort over 3 weeks.
Cetirizine with
montelukast.
Vitamin A & Vitamin D in therapeutic dosage.
Continue with multivitamins- supports the immunity system.
Steroid
nasal spray as was prescribe already.
Antibiotics only if there are signs and symptoms of infection.
Steam inhalation.
And
Most important to keep away from the allergens causing gall such problems. Your keen observation alone can find what to avoid. This is basically the mainstay of your treatment.
Get a Doctor with whom you can discuss this and get a proper examination and prescription.
This helps almost all my patients and would help you too.