What Causes Pain In Deep Shoulder And Chest?

Hi I am a 31 year old male. Two years ago I wad in a propane fire/explotion, I have been working my way back to my old strength, two days ago I went to bed and woke up with a pain in my upper shoulder deep in and pain in my chest, I wrote it off as a pulled musical in my cest most of thr pain in my chest has stoped but my shoulder is in so much pain it hurts to breath, walk, hold any waight, and even to stand up. I was taking naproxasotium but it dosn t seam to work. It even hurts to hicup