Parsifal, you sound exactly like my husband. So is it a matter of motivation/discipline, or truly a brain function?
He has a really hard time prioritizing, and often ends up doing neither when faced with having to make a choice between doing two tasks. God forbid he has THREE things to do because it can cause him to curl up in a paralytic ball out of frustration. Our T and his pdoc both say that ADD meds can help and want him to try a stimulant instead of his current Strattera, but he doesn't see the point (and that's the depression compounding it).