I interpreted this song as losing someone you love, and it's hard to keep yourself going through life. "Oh, I've been low, but damn it, I bet it don't show"
"It was heaven a moment ago"
These lyrics really relate because lately I've been feeling really low, and sometimes it's hard to find light, even if there is so much around you. My parents didn't even notice that I was not doing great, but my teacher did notice and now I have help that i needed. Guys though, if you are feeling at a low point in your life, there is so so much to live for, even if you don't feel like there is.