I have been coughing for 3 weeks, it is dry . i have asthma and sporadicaly crisis. what should i do?

Asthma: There are three conditions that may give you persistant cough for more than three weeks and they are post-nasal drip, gastroesophageal reflux and asthma. Now ifyou have sporadic exacebations cough at nigh is very classic, mild persistant asthma or ocassional exacebation are frequently treated with as need it bronchodilators such as albuterol but if you have asthma you may have post nasal drip.

Asthma and Cough: Your asthma might also be exacerbating and not as well-controlled as it needs to be. I would strongly consider seeing your asthma specialist to have repeat spirometry and possibly maximizing or changing to a different asthma controller regimen.

See your doctor: You need to be evaluated by your physician to determine the cause of your dry cough. It could be due to asthma and, if so, you may need to temporarily increase your meds. However, there may be some other reason for your dry cough that would require a different treatment entirely. Your physician can evaluate you so that the correct diagnosis/treatment is rendered.