Pinch lyrics

My kidneys scrape my back
My lungs get hard and crack
My heart's trying to hide
Sandpaper on my insides
[ Lyrics from: http://www.lyricsmode.com/lyrics/a/acetone/pinch.html ]
And this is not a joke
There's nothing in my mouth, but I feel like I'm gonna choke.
I tried to tell the doctor, but he just misunderstood
The way I'm feeling
And it ain't no good.