Okay, I already had a question about what my dreams meant but I kinda need some advice now.?

I have been having nightmares almost every time I sleep. A lot of them are having to do with demons or possessed items or people, and the rest are incredibly demented or gory and they wake me up and I am frightened so bad, and feel so sick like I'm going to throw up, they bother me so bad. And it seems every time I go to sleep I have one and I don't know how to stop, they're starting to bother me so bad I don't want to go to sleep. Why is this happening and anyone have tips on how to make them go away?