So I've been ill on and off for some time with nausea, headaches, joint pain etc I've also had on and off hints of chest pain and tightness but now whenever I'm lying down (occasionally when standing) I can hardly breathe and my chest is very sore. I haven't been getting sleep because it bothers me too much to get to sleep. No matter whether I'm on my side or on my back, I am left breathless and in pain. I was wondering what could be a cause of this?