I know this is a joke, but I think the real point is anti-dooming. Your mind feels like there’s nothing you can do, but it’s hyperbole. There’s always something that can be done, and even just brainstorming what those things are in a hard time can help lift your mood. And it’ll help even more if you actually end up doing them!
I’m no lemonologist but it looks like it could maybe be a very severe case of Citrus Bud Mites: https://www.inaturalist.org/taxa/384904-Aceria-sheldoni