This is burn out! You not only have constant fatigue, you have no energy, you have no interest in anything. Nothing excites you, nothing gets done and no matter how hard you try you can’t motivate yourself to do anything.
You have no energy for yourself, your family or your career. Nothing!
It is a long way back from this state. In my first burnout it took me 8 weeks to get back to work. I was back in six weeks for the second although it was months before I was back to full capacity.
That's why I do what I do; I don't want to see anyone, ever reach this state. The land of the zombie.