I ve now had cold symptoms for 7 weeks - it s not an allergy. Have been to my Dr three times - she ultimately prescribed amoxycillin, then doxycycline, then prednisone, chest xray was negative. at night my coughing and phleghm go away, an hour or so after I get up and most of the day and evening I am symptomatic with a nasal drip and phleghm issues, the phleghm is basically clear. I dont know what to do!