I ve this problem a bout a month ago, I could not sleep when lying down, I could not breath, my noses blocked , I ve to sleep in a sitting position. I took 2 days/4 pills of Mucinex 12 hours, this generated side effects; I felt depress, bleeding noses, irregular heart beat. I went to Walk in clinic and received 5 pills of azithromycin - this helped clear all symptoms for a bout 1 week, but the condition of could not breath when lie down. I m now sleep in a sitting position. I would appreciate if you have any advice that help with my condition. Thanks.