WBA, it's not even a decision to make. You're not in any shape to be running, and don't have any real running experience over the distance.
Do not run.
People who have sponsored you will understand, and switch the event.
ps Lisa above...you post that last line at 7.17 on a friday evening. Her race is on sunday.
Come on...do you think she can get to the doc in between 
Edited: 19/10/2012 at 19:29