My counselor gave me some good practical tips for facing the day when you feel like you can't do anything (which it sounds like maybe you feel right now?). Write out a schedule for the day. It has to be written and fairly specific. Also, make sure that you have something at the end of the day to look forward to, whether it be a movie, book that you like, just something to look forward to. For me having a break during the day sometime for a cup of tea or watching Perry Mason at lunch helps too.
Also, if you can't get your thought patterns off of the negative, it helps to repeat a postive affirmation. The one I have been using lately is "I enjoy thinking positive thoughts that make me feel good about myself and my life." It may sound hokey but it helps to break the cycle.
This sounds pretty simple, but having a written schedule and something to look forward to at the end of the day has helped me get through many days especially with tasks that I don't want to do, or when I just feel very depressed.
Hopes this helps. I'll be thinking of you this week.