I don't know if some of it is similar, but I can sort understand some of your experiences.
It is like the energy is focused on what is perceived as "important" and when you have time alone then there is a just a feeling of being drained and the body shuts down because of all that energy to maintain appearances.
I don't know if there is an insecurity with maintaining appearances and without thinking putting in more energy into people than they deserve, but I can understand the feeling of giving work ( when I had work) more than it deserved.
That is a me thing and maybe it is relatable.
I can't really offer any advice because I have been forced to just keep going without much quality involved working on improving and I have a lot of maladaption developed from that.
I do think the advice offered by others has merits though and hopefully you can find something that can lessen or at least help spread out the intensity of your concentration