I am unhappy at work and my performance has decreased - how do I do better until I find another job?

I am in a job right now that I really dislike. I have been there for 2 years and I am looking for another one. Trouble is, I am working for a younger woman (I am 33 and she is 25) who is a work-aholic and annoying ms. perfect (the kind that never admits to be imperfect or making mistakes!! ew!). I have been so unhappy that my work has been really poor lately -- i have trouble concentrating and caring. this is NOT like me -- as every previous employer raves about my work. I need to find a way to focus and be positive until I can find something else. How do I do this?