Hello and hope you are doing well.
Repeated episodes of dry cough, runny nose and throat irritation could most probably be due to allergens. These are substances like pollen, dust, animal dander, certain foods, insect venoms and certain medications. Exposure to allergens causes a runny nose with a resultant post nasal drip where secretions from the nose go backward into the throat and irritate causing cough. Cough is a protective mechanism by the body as it helps to prevent infections. You will need to consult your primary care physician for proper clinical assessment. In the meantime for relief from your symptoms you could do warm salt gargles and take OTC antihistamines.
Hope this helped and do keep us posted.
Allergans that irritate the airways cause swelling, itching and watery secretions.This is reflects the symptoms you are experiencing to a tea. Dust, animal dander, mold spores and insect feces (bed bugs/cockroaches) are common environmental culprits. Eliminating any environmental causes and treating symptoms with benadryl or allergy pills should resolve your discomfort. Hope this helps. Well wishes to you!