Hello You are an asthmatic patient and taking treatment for this . There are certain triggering factors ( causative ) which are usually responsible for asthma , these are , dust mite, pollen ,mold, FUMES, SMOKE SMOG, HUMIDITY EXHAUSTION , sudden fall & rise of temperature , humidity . So you know your triggering factors , so , if possible get rid of these triggering factors. When some one get contact with these allergen , there develop bronchoconstriction , hence bronchospasm and whistling sound during inhalation or exhalation ( as in your case). This allergy causes ( produces ) shortness of breath ,wheezing , chest tightness and cough mostly early in the morning. So the best way is to avoid these allergens. When such patient visit my clinic I advise them to take monteleukast+ bambuterol tablet once or twice in day till complete relief. Hot coffee and steam inhalation also provided relief. Hope this information will help you.