I've been there too. I don't exactly know what you mean about sick, but everything else you described I would say is dpdr related. Having a bad sleep schedule definitely adds onto the feeling of dpdr, for me at least my worst days have been after a bad night of sleep.
When I have a difficult time sleeping because of these feelings, I'll wake up in the middle of the night completely helpless of how weird I feel. Things exist, but at the same time they don't. I lose the feeling of my body and I feel as if I'm still dreaming. And a bunch of dizziness as well.
I honestly have no other advice other than trying to improve your sleep schedule, as well as focusing on getting good quality sleep. Now I don't know what you mean about being sick and "going to die", but to me my feelings of dying usually is a sensation of disappearing into thin air.
I just want to assure you that there's nothing wrong with you. I know it's hard to believe, as I said I've been there. But unless there's something physically wrong, which I doubt there is, these are all just symptoms of dpdr. And they're all more noticeable when we're sleepy and tired, it just makes everything more confusing and harder to control.
Hope you'll feel better soon!
