If your symptoms include a runny nose then you may have what I suffered through last year around this time. It was a bronchial infection that would go away then come back again. The cough produced most of the time, no mucus in the throat, but it was really deep. At times when coughing I felt lightheaded. Nyquil liquid should put you out at bedtime. Also, at night, position your pillows at an angle so your head is not laying flat. This helps in the case your nose/ throat is draining, which produces the cough. For me, I just had to let it run it's course. It took several weeks.