There is more than one type of burn out that is causing this, I do think. Most of us have no idea just how much brainwashing we are all under, but it is proven that there is a brainwashing breaking point where it really does add to making one emotionless.
Another part of this bun out might be that you are having to put faith in quite a few things that do not deserve such faith at all. Work smarter, not harder, is now a brainwashing thing that has turned on its head for it, where it just does not matter to work smarter or harder at all.
I am betting that you need some form of a decent vacation. That won't cure it for you, but it will help to see exactly what is causing this in you, once you come back from it.