Hi. I have come down with a cold - bit of a sore throat, slight runny nose, tickly cough. I don't feel particularly unwell and have no fever. The weird bit is that when I lie down, my "out breaths" feel fizzy, like eating popping candy, but in my upper chest or throat. It sounds like a rattly chest as if I am really ill. But I feel fine. Is it just air moving through mucus?