The weird thing is, I suffer in it for a day, or less than a day, and then it clears like smoke and I'm back in the enjoyable present. That's why I've been thinking it has something to do with self-care, like, sleep deprivation, bad food, et cetera. It's also pretty rare these days - I honestly didn't expect it to happen any more, and it's the first time it's happened this year.

Also, I think it might be a sort of obsession-in-disguise. That is, if my current social life is difficult, for whatever short or long term reason, my brain creeps around to this older thing like a dog worrying at a familiar chew-toy.

I'm a very obsessive fellow :D