Do you think it's just your subconciousness talking to you or is it louder than that like an actual person "speaking" almost as though he was sitting right infront of you. we all have a subconcious and we all have converstaions with our "ego" and I'm sure most of us have negative comments from our "ego" at times. if you feel though that the voices are loder than that and actually sound like a humans voice than perhaps go and talk to a psychiatrist regarding this issue. it may be nothings at all. just everyday stresses bringing it on or it may have to do with something else. either way best to go and check it out. I'd probably recommend you go and visit a gp firstly actually and see what they say but if you are really overly concerned go and speak to a psychaitrist first off. (I am having a mental blank today and i am sure i spelt that wrong. lol)