I liken coming home from the psych ward as the same as coming home for any illness/injury. Your brain needs time to adjust to your regular life rhythm, like getting used to crutches when your leg's broken.

When you're that low before there is always the possibility of it returning. The thing is, you'll still need rest and a gradual acclimation to your RL routines. Don't try and rush it or you might be overwhelmed.