Gosh, Tracy, the fact that you even did it is amazing to me! 56 KM is nothing to sneeze at -- I think that I've walked forever when I only have to go two blocks down the street!
You really did well and I'm proud of you. So sorry that your feet didn't hold up and that you weren't feeling well. It's an old saying, but it's true: It's not the winning that counts, it's the trying"! Good for you!