Night shift making me sick?

I started a straight nights ICU job back in April and I think it might be killing me. I’ve always done roasting shifts in the 5 years I’ve been a nurse with little to no issue. I took this job because it’s Monday-Wednesday nights, no weekends. I thought the schedule would be great because it doesn’t vary.

I literally think it is killing me. My sleep schedule has adjusted to nights but on my off days I am MISERABLE. I can’t eat anything. I’ve had constant GI issues. I’ve had a stomach virus for a week and it isn’t going away. I think I’ve built up a huge sleep deficit. I’m depressed. I’ve tried everything to help make it better and I’m desperate.

I’m applying to CRNA school and have to tough it out through December. But if I don’t get in I don’t think I can do this anymore. I may just have to go to the PACU and work days.

Has anyone else ever had this happen? It’s the worst I’ve felt in my entire life.