Psionic Ghosts?

So, I was alone in a cabin on a mountain in the middle of the woods this one time...

...I know how it sounds, right? XD But it's totally true. I was about 16 at the time, on the outskirts of Asheville, NC, and my parents were out to dinner with a couple of friends. We were "renting" (for free) this house for a couple of nights from one of my dad's coworkers. I was sitting in the room, watching TV, and thinking about how the lady who owned the house was talking about how her 20-year-old son and friends liked going into the woods sometimes with a video camera, and doing a sort of "Blair Witch thing", as she said.

Well, they had this little dog. White thing, barkey, but friendly and playful. It was outside. I just started getting paranoid. I shrunk into my chair, and started getting this paranoid feeling of "what if there's a murderer out there? What if he kills the dog?" This went away as I assured myself it wasn't true. My parents were out to eat, there wasn't anyone around for a quarter of a mile. I was safe.

The unease stayed, and increased throughout the night, culminating in the absolute worst nightmare I've ever had. At the end, I was too scared to move, and too scared to remain where I was. I got a glass of grape juice and felt better, though still a little shaky.

This past year, I asked a girl on campus who knows a lot about the paranormal, spirits in particular, what this could have been. She said it sounded like something was psionically feeding off of my fear, and once sated, it went away.

I have to say, this wasn't a pleasant experience by any accounts. The dream involved gruesome images of torture. It was totally macabre.

Has anyone else had an experience like this, or have you heard of such spirits? I'd be very interested to hear any stories.
(I thought it best to put it here since it's ghost-related, but mods can move it as you see fit. =) )