I am really gong through a rough time emotionally and in all areas right now and need someone to tal

Had to work again until 3 AM sunday, biting heavily into the one day a week I could see my children. On my feet 12 hours Sat.
Slept poorly due to leg cramps.
Boss called at 10 AM re something I had fixed. Very depressing to have a 6 hour window to see my children per week.
I need to get my boss to sign off on an 23:00 cutoff time Saturday nights so I'm not exhausted next day.
I feel like I have been "lost@work" for 10 years. How do I keep going when I want to just drop dead? I still have no GO, no Ooommph. Why do I keep waking up?