I've done some soul searching since my last post. I've come to realise that the root cause of my burnout is not my work at all. The real problem is relationship related, and my compromised ability to concentrate on and organise my work, which I initially interpreted is being the cause is in fact a consequence.
Worryingly, while the relationship issues that are causing the problems are essentially unrelated to my crossdressing, as with my work, my ability to organise outings has also been compromised as a consequence of the burnout problem. That compounds the problem, as spending time en femme is something that I enjoy, which helps to make me more productive in general, and would probably put me in a better frame of mind to deal with the relationship issues that I'm struggling with.
Where things go from here, I don't know any more. I've been clinging on by my fingertips since at least 2007, and I don't know if I can do it for much longer. Don't worry, while I'm depressed, I'm not suicidal at the moment ~ that was last week. Something will have to change soon, but what and how is up to my wife, as I've done everything I can to sort things out.