allergic rhinitis
"For the last 6 months I have had allergies like never before in my 32 years.   Constant nasal congestion and dry coughing.  I have been miserable.   OTC antihistamines were not cutting it, so My doctor put me on Xyzal and Azelastine back in June. This improved my congestion but after catching a cold in July I ended up with the same symptoms and a dry cough that would not go away.  It kept me up at night and I was miserable.  He put me on Singulair, and since then the congestion has improved and I can sleep through the night without coughing!"