hi xroads, it seems weird that you only get this feeling when you are discussing ghosts etc on here. I would think if there was something in your house you would feel it more often.
The things you describe (apart from the dvd player) could be caused by low frequency sound
http://www.meta-religion.com/Paranormale/Ghost /ghosts_created_by_low_frequency.htm
I know thats not a lot of help, sorry.
If I were you I would ask the same thing on a supernatural/paranormal forum, theres quite a few good ones and this kind of thing is discussed on them all the time. Good luck :)