I am a 54-year old woman and have had a chronic dry cough since Spring; everyday I get at least five bad coughing jags. Last fall I had a similar cough (though I seem to recall it as a wet cough) but my doctor concluded that the cough was attributable to post-nasal drip and it resolved during the winter. I m concerned that this has been carrying on every day for at least five months. No other major symptoms exist except perhaps tiredness and achiness. How might you proceed with diagnostic procedures?