I hear some bubble or something like that in my nose and near lungs area while breathing. Mostly when I breathe out. I have severe congested nose and cough for past one week. I am taking medicines for cough. No fever. Cough and nose blocked.  Nasal congestion and sinus pain.  Head cold too. If I lay down and breathe, I hear that bubble sound every time. Is this beacuse of cough and nose blocking? I used to get cold and cough before and that used to resolve soon. This sound while breathing is new and worried about it. Nose is completely blocked and throat is congested too. I have to cough up the mucus all the time. Post nasal drip throughout the day. This nose congestion and the bubbling sounds while breathing out since last week. Is this sound while breathing out common with sinus congestion and pain? Never had this before. Is this something serious?