Hi,I am 14 years old and I have really been struggling to catch my breath. I have to take short breaths and when I do take deep ones, I feel like I need to cough lots of stuff off my chest,but it is a dry cough so it makes me gag. When I do cough it up, it is like a lumpy greeny-yellow colour. I cant even walk up my stairs without nearly crying because I cant breath,even when I am lying down watching the telly, I am out of breath. Could anyone help me please and have an idea of what this could be? Thank you.