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I have a cough, although it doesn’t go on quite as long as with the OP. Mine is most prevalent at bedtime and in the morning, but will also occur during the day. I often cough so hard and long to expel mucus that it causes cramps in my intercostal muscles in the back and in my transversus thoracic muscle. The cramps are quite painful. I discovered a device on the internet called the Air Physio that is an Australian product. http://AirPhysioglobal.com for the US market, the device is shipped from IL. I have waited a few weeks of use before posting about the device, but I believe it works. There are many positive reviews, mostly from COPD and Asthma sufferers. It uses an Oscillating Positive Expiratory Pressure to assist in dislodging mucus, thus making it somewhat easier to expectorate. It does cause coughing sometimes during and after use. It does seem to make the mucus thinner and less tenacious causing less work (hard coughing) to get rid of it. It certainly seems to help reduce the coughing when I go from vertical to horizontal at bedtime. When you use it, you can feel the vibrating pressures in your chest as the steel ball is raised and lowered by your exhalation. It is also supposed to assist in lung capacity, but I can’t attest to that until my next PFT. It does give me some relief so I wanted to recommend it. Your mileage may vary, but I thought it was well worth the $60 expenditure.