It sounds like you know you are thinking these things and they are not true. I would keep reminding myself of that and treat it like any other fear and "do it" anyway? Make yourself eat a balanced diet and go to bed on time at night. If you have an English course or interesting course that has a lot of extra reading, take a book to bed and do some reading before you try to get to sleep. I like to read before sleep as it gives me something "else" to think about as I am trying to go to sleep, I can think about the book situations and characters instead of worrying about my own.

One thing I do to keep my thinking in check is to remind myself of my own history. Have you thought you were being poisoned before? Were you poisoned? Then why would that be different now. Remind yourself it is just your thoughts and see if you can laugh at or make fun of them and "enjoy" them that way. If you call their bluff, they can look ridiculous and will tend to go away. Who or why would anyone want to poison you? Think about who might be poisoned, spies or Sleeping Beauty or Snow White. Imagine yourself as Prince Charming You "know" your thinking/feeling is a bit off so take it to an extreme so it is a bit funny. Would you kiss a "Beauty" in this world, sleeping with drool wetting their pillow? Study obscure people who died by poison? https://en.wikipedia.org/wiki/Giovan...ella_Mirandola