I am so sorry to hear you're going through this. No one wants or needs to live like this. It sounds like you're sacrificing your life for your job. I have felt like this before too. One day, I finally had to take the world off my shoulders and think about "me" for a change and stop worrying about everyone else.

The extreme fatigue could be stress, depression, chronic fatigue syndrome or a combination of these things. There could also be another underlying health problem there.

Please please please try to take a medical leave from work or a leave of absence. Whatever it takes, do it now before it destroys you. You're too stressed out to live your life. Is it really worth it?

I really hope you get resolution soon.Believe me, your job will learn to manage without you for as long as it takes to get help. Best of luck with this