I don't know of why I had was the same, but I had a similar symptom where excess mucous was causing me to hack up a lung or two all day long.
My doc gave me penicillin vk 500 3G daily, NasalChrom (chromulun sodium) to apart in nose - do it IMMIDIATELY after hot shower for best results, ibuprofen (1-2 pills every 4 hrs) and benadryl.
Within 3-4 days it was gone after a month of suffering. Not sure if it will work for you. But it did for me.View Thread
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