So sorry to hear about your continued suffering. I recommend that you speak with your doctor
. First, we need to try and find the reason for your cough. A dry cough can come from many different sources. One of the most common causes of a cough is an infection such as a viral upper respiratory tract infection, or URI. Even after you have seemed to recover fully from the URI, you may continue to have symptoms of a cough because the receptors in your upper airway have been sensitized, meaning that the threshold for them to trigger a cough is much lower than it usually is. Usually, the cough mechanism is a defense against aspiration and other things that can make you ill. Another common cause of a dry cough is reflux. Many people who have no obvious signs of heart burn will still have reflux that contributes to a cough. Sometimes, a trial of an over the counter medication to decrease stomach acid will help with the symptoms. Usually, it is a good idea to speak with your doctor first. Finally, there are many medications that can contribute to a dry cough, with ACE inhibitors being notoriously bad at causing cough. Other medical problems can also contribute. Again, please speak with your doctor about this question.