Horrible things might happen - and they are horrible - but the shock and sadness don't feel like depression. They feel like shock and sadness. In other words, like they're supposed to.
So when you have a monstrously shitty weekend, for reasons that don't even really matter, you're prepared to feel monstrously shitty. But you're not prepared to have it feel like depression used to feel.
Not prepared for the feeling of hopelessness. Of worthlessness. Of being unloved and unlovable. Of rejection and isolation. Betrayal. Confusion. Humiliation. Loneliness. One bad feeling engendering another, like a snowball.
It's been so long since you've had those feelings, it knocks you on your ass. And wears you out. The exhaustion is overwhelming. Emotional exhaustion. Exhaustion from feeling like you're once again back on your heels and playing defense in a battle that you thought was over. Exhausted from feeling awful, and by the prospect of waking up tomorrow and continuing to feel like this.
All you want to do is go to sleep and not wake up for a long, long time.
Of course, that's not an option. There is work to do, employees to supervise, a house to maintain, children to raise. You know that you have to get up in the morning and attend to responsibilities. And most likely, and with any luck, you'll wake up in the morning and things won't feel so grim. Everything will be OK. A good night's sleep, and some perspective, can do that.
But right now, it sucks. It's astounding how much it sucks.