Oui, if you are mentally and emotionally down, especially to a certain point, your body will actually start to shut itself down.
Then you'll start to get sick, although, it varies.
With me, I first get in the state where, I can't eat, because if I try, my body will reject it.
And even though I'm tired, I can't sleep.
Then, if it gets any worse then that, I can actually send myself into coma.
Or as I like to call them - stand stills.