'Sense of impending doom'. It means - outside of the context of literal impending doom - that your body has noticed something very wrong but can't identify It. Doctors take it quite seriously.
Madness string 105723
You are not the light of my life, making you happy isn't my greatest dream, your smile is not all I live for. I've got my own stuff going on. But you're strange and fascinating and I've never met anyone like you. I want to give you everything just to see what you would do with it.