What to do when it's flat.

I hate days when writing that you spend a day working on a piece of work only to finish, read it and find it is flat. That has happened to me today. I've been working on a short story for the Writers News magazine. The theme, bullying. I'd previously written 500 words and had another 1000 to go. I wrote on oblivious to the dead boring story I was writing. By lunch time I'd finished. Stopped had lunch and read the story back. Oh dear! what drivel. I'd written a peice with no emotion, no action and nothing to make the reader smile. Some would say it was a complete failure, but maybe I've managed to get rid of the drivel which will alowe something good to come out. At least that is the hope.