Hi WePow,
As far as I know, what you are describing is something called depersonalization - an altered peception of yourself and your surroundings. If you had trauma or have an anxiety disorder it could be down to that. It is a kind of dissociation and can have an unreal feel to the way you experience yourself and things around you (background can move forward, etc.). Like a dream. I am intrigued by the sound effects you are describing (different words are said and empahsised compared the what actually was said). How often do you get this?