nightmare

This isn't the first dream to disturb me recently. But I can still feel it. Last night, I dreamed about a man stabbing me.
It started with myself and a few other people at a cabin. The dream skipped to that night when the man was picking us off one by on, killing us with a knife. While i was running, I ran past a door as he was coming out of it. I screamed, and the next thing I saw, I was on my back with the man over top of me. He gently kissed me, and as he did, i felt him drive the knife into my heart.
When i woke up, I had the feeling of the knife on my chest.... These dreams are really starting to bother me...