Lots of things you can do for an ITB. BUT you don't want to pisz it off anymore than it already is, so lay off the running. You have the fitness for the race, so be smart about this.
Lot's of stretches you can do. Google the ITB or go on runnersworld.com in their injury section.
With the proper protocol you will be ok come race day, just be careful and keep up the stretches even after the pain goes away.
OY if this doesn't happen to ALL of us at one time or another!!