I think you are correct about your dream representing different moods. I wonder if the one room you fear is something you either have repressed or don't want to think about.

I have had similar dreams. They are usually lucid, but at times I can't convince myself in the dream that it is just a dream. I've also had sleep paralysis hallucinations.

In one dream I hear someone at my bedroom door, but I can't move. I can't even turn my head to look. Each night the dream progresses until one night I feel a hand pressing down on the center of my back to the point I'm in a lot of pain. After I wake up I feel as if I was hit by a car. A memory I had repressed about being raped in college came rushing back. After going though all the emotions and sharing it with my tdoc, I thought the dream's purpose was to bring this memory back because it was time to work on it and the only way I would was if my subconscious brought it back.

Just a thought.