I have ADHD for which I take meds. They are not working right now and I didn't realize it until I walked away from a half-made bed, for no particular reason. Ahem.
That's why I haven't been able to get anything done lately. I called my doc for an appointment and we will discuss treatment options later this week.
For now, I just have to work harder to do the same things that I didn't have to work that hard to do before. It isn't because it's actual hard work, just that it is hard to keep doing the work. More often than not, I take a break and return, I don't complete the job in one swoop. But I return again and again until I have finished.