Like most annoying human things it's really just a healthy mechanism that's been pushed too far.
I'm pretty sure it stems from "This is going to take work so I should rest and maybe eat something first"
But when you are exhausted all the time, and/or don't have enough time, etc... It gets pushed too far and you get caught in the loop of "I just need MORE rest and maybe food first" infinitely, every time you look at it, because of disability and capitalism and then self re-enforcing habits and so on.
The best advice I can give is to learn to consciously gauge what your actual limits are and how much rest or recovery you actually need before starting, and to maybe break daunting things down into smaller tasks and rest in between.
This doesn't really help for things that have come up that you can't really put off, except maybe to help inform you that you are in fact maybe being over extended.
The fact that most of us live most of our adult lives in a state of constantly being over-extended and accepting that as normal is kind of a problem.
If you are encountering the problem a lot, it might mean you need to take on less, or get something diagnosed, or sleep or eat more.