Lost interest in work

over the past few weeks i have found it very hard to get to sleep, and i have lost interest in work, so much so that i miss dead lines, i want to do the work, but i can't. Sometimes i feel like this for periods of time, and i think that people hate me and everyone is out to get me, other times i feel as if the world revolves around me. I have been told that i talk to myself a lot, and i feel as if i have three voices talking to me (but they are all my voice, just different parts of my mind talking). I have thought about suicide, during the period i'm going through, i do everyday, think about it, i can feel happy and sad at the same time, and i can hate myself for being myself, i think i'm the worst off

what do i have? and is there any way of treating it or getting rid of it, my friends recommended me to this site.

Contact a psychiatrist for diagnosis and perhaps treatment.