The analogy works well. Zombies are disconnected from themselves, dead walking, operating on automatic. And the specific idea of being only a shadow of our former selves, of mimicing what we used to do but not really getting it right, all intriguing too.
Myzen, what you describe also reminds me of the -as if- technique. Useful skill, to act -as if-, even if we are not fully there yet. Fake it til we make it. Not a bad thing at all, maybe it is like starting up our motors, practicing, doing it til it is more natural once again.
Do you have a decent doc, have you been screened for the usual physical suspects when it comes to exhaustion? Anemia, thyroid etc?
We can work on our zombie walk, the zombie moan will be fun to do too.

And the desire for braaaaaaaaains, sometimes brains is what I lack, sometimes I cannot even think straight.
Best wishes,
Sarah