I had very bad concentration problems when I was most severely depressed... unable to read at all or even get through a TV show.

Welbutrin and Celexa helped me with my depression and I am able to read novels again. Not to say that you should try Welbutrin but just to say that the concentration and motivation can indeed come back. It may take a different med or dosage for you or it may just take some time.

I agree that you should talk to a pdoc about it.

Good luck and best wishes