Unfortunately, it is not uncommon to have a cough persist, for days, weeks or even months after a respiratory infection. This is especially true for a person with asthma, whose asthmatic airways may have become inflamed due to an infection and then remain inflamed, even though the infection has cleared. The mini-blackouts are a common adverse effect of hard coughing and you must take precautions to hold-on or sit-down, especially if on a stairway when the cough begins. I, too, believe that you should see your asthma doctor as you may well need a temporary boost in asthma therapy until this acute illness passes. And, when you see the asthma doctor, be sure to ask if possibly the alleged pneumonia was not due to infection but instead, due to allergic bronchopulmonary aspergillosis (ABPA), sometimes referred to as allergic bronchopulmonary mycosis (ABPM).
Good luck.
I had a long bout of bronchitis from which I am still suffering the cough (infection cleared up about 3 weeks ago), which is apparently not unusual for an asthmatic. I did nebulizer treatments for two separate stretches during this illness, and at one point, although it was opening up my bronchi, I was sure it was causing excessive coughing. I've been told by one allergist that there is such a thing as too much medication. Go see a pulmonologist -- they may recommend switching to a regular inhaled steroid, or a course of oral steroid to bring down the inflammation, which should in time relieve the cough (or so I have been told by mine).
Hope you feel better soon-