It creeps up. You can be having the best day in your life, and then it's there.
It can be the middle of the day, or the dead of night, or somewhere in between all that.
And suddenly you're wondering why you bother, wondering whether anyone cares, wondering whether anyone will miss you.
It's not a new feeling, not really, you spend your time with people, wondering whether they're just putting up with you, or whether they really like you.
It doesn't matter what you know logically, because logic doesn't help when you feel like this.
But something will trigger it, and you'll find yourself curled up, trying to avoid everyone, crying your eyes