I'm 17 years old and was sitting in my last class today when I felt my Diaphragm give a little twitch. I thought nothing of it until I straightened up it felt sore.
7 hours later I'm still hurting, as well, some other things have come up.
It hurts to take a deep breath and it also hurts to exhale to the point where no more air is coming out of my lungs. I also find it hard to swallow (My throat feel tight and sore around where my collar bone is.
When I exhale or take a deep breath I find it hard to breathe and feel panic coming on for a couple seconds or so. That and my esophagus and some muscles or something tightens up from the bottom of my ribs to my collar bone.