The problem with sleep problems is the more you worry about them, the worse they seem to get. If you have a lot on your mind, its hard to switch off and everything seems so much worse in the middle of the night.
Try not to think "I'm not going to sleep" when you go to bed and try to get a bit of exercise during the day, try to limit screen time before sleep and just let your body do the rest.
I hope it gets better for you Sherzy, being unable to sleep when you're exhausted is the worst. Hopefully its just a blip and you'll be back sleeping well soon