Can't sleep😭😭😭

I am having the worst time trying to sleep. I can't ever fall asleep until at least 1, then I toss and turn all night and I usually wake up and like 5 and can't fall asleep again. I'm so exhausted I feel extra nauseated. I don't want to nap all day and train my body to have a terrible sleep pattern so I keep staying awake during the day hoping I'll be so tired I can fall asleep at like 9 and sleep all night but then 9 comes around and I can't sleep until 1 even if I'm tired! Ugh it is killing me, any advice is appreciated 😭 23w1d