Hi, I'm a 15 year old girl who does no strenuous activities, and for the past two and a half weeks, when I go to yawn or take a deep breath, it feels as if I'm not getting enough air. I was getting mild chest pains as well, but that was towards the beginning and it has gone away on its own. It's as if something in my chest is blocking the path for all air to come in. Alongside that, I've been coughing often even though I'm not sick. I think it might have to do with mucus, or just anxiety. I've been to the hospital for this, and I've gotten an x ray done, and the doctors have told me that there isn't anything wrong with my lungs, and I have no rattling noises occur when I breathe, but I'm still really concerned and would love a straight answer or some suggestions to help with this problem.