Is it possible to blow/injure an ear drum during a coughing fit? Since I first posted, my left ear drum continues to hurt only when I cough. My sinuses have cleared up and my runny nose is minimized, but the cough persists occasionally. When I cough it is bad and I have to hold my left ear to stop it from hurting. The cough is being controlled now by cough drops and continual fluids - mainly water. Anything else upsets my stomach too much.
The term reactive airway disease, in a strict sense, describes the distinguishing feature of asthma, hyperreactivity of the airways and that means the airways of people with asthma constrict in response to allergens and/or irritants in low concentrations that do not cause constriction of the airways of people who do not have asthma. Practically speaking, the term reactive airways disease is used interchangeably with the term, asthma. Your sister may be right, given the seasonality of your cough and congestion. Most people with asthma wheeze, as you have, but for some the dominant symptom is cough. However it could be allergic inflammation of your nose, called allergic rhinitis, and the postnasal drip associated with rhinitis could also be the cause of cough, with or without asthma.
Your use of decongestants and antihistamines is fine, especially since they seem to give you good relief. But, if the cough persists despite these medicines, especially if you also have some wheeze, then you will probably need asthma medicines to control your cough and other symptoms. Eventually, you will probably have to see your doctor to sort this out.
In the meantime, consider what substances you might be allergic to in the home and workplace, substances in the house or in the heating/cooling system.
Good luck.