Yeh I know. I think the core functionality of a bullet journal (minimalist, mostly just doing dailies with an index) is the most useful thing to get right and if developed as a habit can work even when you're overwhelmed and have less time. I just find even getting myself to open a notebook is a challenge when I'm all frantic and all over the place.
I consistently use a notebook for work (sort of) but find that I have a tendency to lose it everywhere if I carry it around too much also. I started using Google keep so I could have access to my thoughts everywhere and didnt have to keep walking around with a notebook I was likely to put down and forget.
Sometimes feels like these days are the norm to be honest and the days where I can do stuff is the exception to the rule. I've managed to up my work productivity massively with meds and habits but man life is still such a challenge. I find I feel suddenly hopeless whenever I have ''free'' time.