Hi, I hope you didn't feel like I was questioning your choices too. I wasn't, I just felt like our situation is uncannily similar in many ways so I wanted to give you this warning in case it's anything like that for you with regard to limited work capacity.

I have managed to finish most projects since my post and I'm kind of almost back on track now... But I think it gave me a lesson that maybe I'll finally remember.

Anyway... As for building concentration, when I started working, I had a lot of focus issues, I simply learned techniques first to still do some work while unable to focus well (job-specific techniques so I can't really describe it here), and then over time it all went away simply by practicing just sitting down and trying to focus, mainly by first trying to understand some very simple bits of the job in front of me and once I managed to get a hold of a simple bit, I'd be able to focus a bit better and that would build up. So practicing this, I got back to normal in the last few months.

I'm not sure if you are asking about the same kind of concentration issue here though. If you are asking about how to maintain the concentration once you do already have it... that's a different animal. I have no idea what kind of job this is for you so this will be general, I think practicing focusing on the details in front of you and practicing not looking at anything else is good in general.

But if your subconscious is struggling with unsolved psychological-emotional issues, it does take a toll on the brain to try and keep it all blocked out while concentrating on work. I don't know if that's the same with you. Currently I am thinking of scheduling separate time for trying to deal with my psychological-emotional issues. Sit down for X amount of time and focus on them then (with strategies to bring out the feelings without having to get lucky for that first) and then go back to work.

I'm not sure if I can give any other good advice right now. I just hope you didn't feel I was trying to question anything you are doing or want to do. Let me know.