Oh gosh I’m a published writer and I’m 40 too 🙂 and just recognised my symptoms last year. I’m having the same problems and I’ve writing my ‘magnum opus’ for the past 12 years, re-written it 3 times and started all over again this year. The thing is that as much as ADHD is against us we also have hyper focus to achieve ‘flow’ with our work, and the book by Mihaly Csikszentmihalyi tells us how to achieve that, and why. (Apparently immersing ourselves in high concentration activities leads to fuller and happier lives) Perhaps ADHD is holding us back with basic tasks, but it is a two edged blade, and perhaps we can all learn to use it because it’s easier for us to exploit our ‘hyper focus’ and turn it instead into ‘flow’. Don’t give up, read Mihaly Csikszentmihalyi’s book, I’m finding it helpful.