
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



I assume you are getting help and some form of therapy if you received a diagnosis and taking tests.
I don’t know if this will help and I am sure someone more qualified can correct me, but maybe you can make improvements with framing things in a different way.
Like you say you have an over-active imagination, perhaps try and frame an element of work towards a goal or make a checklist of what you need to do and reward yourself when you complete say 50% of the goals in the day and try work yourself up to 75% and then 100% of goals. Make it into something you can interact with and look at it like a game and a form of motivation.
I don’t know, for me I can do things in short bursts when I try and force myself to try move forward and I think the longest streak was when I was able to “hold myself accountable” for doing a certain amount of tasks in a day.
For me, a common thing that seems to help is to do something and “reward” myself if I make progress which seems to be a generally positive reinforcement to me.
So I guess try and frame it into a reward system to make yourself feel like you achieved something instead of a burden. I do not know if that is wrong or more harmful but maybe it can help?
I mean I am coming to terms that I have a little bit of everything while I learn about myself and the closest I got to a diagnosis was an unofficial one of ADHD, Depression and Anxiety