Take a heavy dose of Alien, add a lamprey-shaped monster and a bit of shag carpeting, and you've got Malaise, a fast and fun short film about an astronaut fleeing the hungry creature aboard her ship.
I used to attribute that feeling of slight aching, fatigue, and general awfulness to life being terrible. But it turns out there's a cure for common malaise. Hypochondriacs, this is your vindication! You're just missing a brain chemical called orexin.