What a bummer! I think if I were in your position and had been told that running won't cause any more damage, I'd keep training for awhile and see how it feels. Were you given any suggestions for minimizing the pain? Would icing it help? Is it in a position where you can wrap it and get some relief?

I hope this settles down so you can do the marathon after so much training but if it's too painful, take care of it so you can recover and move on to a new goal.

Hang in there.
Deb