I'm sorry, my friend. That's a terrible, exhausting place to be. Something that kind of helps me is doing small tasks, like just washing one dish instead of the whole sink, or folding and putting away one outfit instead of trying to do all the laundry (or whatever that would be for you, like reading one chapter of a book, spending 10 minutes on one task/fun thing). If nothing else it gives you a little bit of accomplishment which can help with motivation a little, even if you're not getting enjoyment out of it, and it can seem less overwhelming.

"Just keep swimming" sounds like such a joke, but in a place like this, sometimes you just have to try to keep moving until the cycle goes around. It WILL go around and it won't always be this bad.