The "end" is just a metaphor. It's talking about your world getting turned upside down by something unfortunate, such as a death of a loved one. The world isn't truly ending in the song. The first two stanzas are about someone coming down with some terminal illness, I believe. Just a story to go along with the theme of the song.(Your world getting turned upside down by an extremely unfortunate happening)
The "end" is just a metaphor. It's talking about your world getting turned upside down by something unfortunate, such as a death of a loved one. The world isn't truly ending in the song. The first two stanzas are about someone coming down with some terminal illness, I believe. Just a story to go along with the theme of the song.(Your world getting turned upside down by an extremely unfortunate happening)