Help? I have very strange and disturbing thoughts in my mind right now?

I feel very depressing right now. I had a huge pair of scissors and I was imagining myself cutting out my friend's eye then stabbing myself in the neck with blood coming out. I tried to get that out of my head, but now I'm thinking of grabbing a knife and killing myself with it. Please, I'm not a troll. I'm thinking very odd right now and I want to stop it. I just can't stop what I'm imagining and the things that I'm thinking are becoming much more gory and disturbing.