Perpetual Burnout?

Has anyone here experienced perpetual burnout? Like most people, I've taken on too much before and burned myself out, but what's happened (I think) is that every time I've burned out, the time until my next burn out gets shorter. This has happened so often that now I feel like I'm living in a state of perpetual burnout. I'm constantly mentally exhausted. I used to go above and beyond for everything (which I realize was part of the problem), but now it's a daily struggle just to do my day job.

I desperately want to get out of this constant fatigue, but since I'm in it, pretty much everything feels like a heavy lift now. Does anyone have any experience with this? How do you find the energy and motivation to get out of it? I want to be productive and begin working towards running my own business, but I can barely (and often don't) manage to do the bare minimum on any given day.