Scared to sleep

I'm scared to go to sleep, and I'm scared to take my sleeping meds. I've been having these nightmares that are awful, and they wake me up but not all the way. So I'm stuck halfway in between reality and a dream. I'm so tired but I just can't fall asleep. I start having unwanted memories, and thoughts and they make me afraid to go to sleep because I don't want to dream about those things. I don't know what to do. Exhausted.