I had a dream. No, not a dream, a nightmare, that I've killed so many good persons, and then killed myself. I wake up, and I'm pretty sure that is like I had the feeling of something cutting my neck.
It was just a nightmare,don't be afraid,and the sensation that you had can be explained with science,basically when dreaming we don't dream just images but also sensations,nothing to be really scared of,and besides,you will not do something like that,you are a good person.