Mine started as allergies. I worked in the yard one day. Next day all stuffed up. Couple days layer, green goo coming out of my sinus'. That means infection. The allergies get you clogged up and create a breading ground for bacteria. All that wonderful goo then slides down your throat/esophagus and gives you a bronchial infection.
Happens every year this time and coincides perfectly with the nice yellow/green layer of pollen all over the cars, house, everything... I still have the scratchy eyes and mild cough but the pollen has subsided with the rain. I haven't been stuffed up enough to spawn another infection.
My cough was the same way. Sounded like a kid with croup and was coughing up globs of good. I had a noticeable wheeze when I inhaled fast but didn't feel short of breath.