Missed My Shift

I'm anxious. I tried to drop my shift for today 7-11pm over 24 hours in advance. I did it because I'm in a bunch of AP classes and have to catch up on work, and because I literally have not slept more than 3 hours at night since Sunday. In hot schedules, I had gotten a notification that two people wanted to pick up my shift, although I was scared that even by 4 it had not been approved. Anyway, I completely passed out until now after school because sleep deprivation was making me feel sick, and I've been really depressed lately. I wake up and see that at 4:30 and 6:30 both people cancelled pick up of my shift, and so I should still be responsible for it and it should have started. I don't know what to do. I think I'm supposed to be written up or something. I'm a good worker, and I've never done anything like this before, but I was really tired.