Oh, I am SO knowing what you mean! I went to the ortho about a month ago and found out the pain in my right knee was due to losing cartilage and the start of arthritis.

I was told to back off on my mileage.

With a month to go until race day? REALLY??!!??

Yeah, right...
So now I have a brace I affectionately call "The Contraption" and have learned to make friends with aceteminophen. I'm good up to about 6 miles before it starts getting uncomfortable

. Then I think about all those Iraqi/Afghan war amputees who are running FULL marathons and tell myself to suck it up. A little pain isn't going to kill me!