Probably, it's a bad idea to attempt to write or read seriously in the weekend.

(i) Decide on a time and a thing to do, set up the environment and get to work.
(ii) Declare to the family that you will do ~ for ~ minutes and do it.
(ii) can also be considered as part of (i)

you should regularly take stock of those chores and tasks that are bothering you. Then get rid of them all at once. It will refresh your working memory and mind.

I'm feeling so unwell today that I can't focus on work. Even sitting down on my desk chair is difficult. I don't think it's just because I didn't get enough sleep last night. I have absolutely no energy.

Wake up early tomorrow and go to gym before the work. Then start tomorrow's work from 9.