I was also frustrated since the half marathon left me beat up. My hip hurt when I walked, and had huge blisters on my feet. I was so sore I just gently shuffled everywhere for the first few days after.
After about a week and a half, everything generally cleared up. I also started working a temp graveyard shift, where I spent hours doing fast-paced can packing at a food storage place. Between this and dealing with a problem, I didn't eat much either.
Over the past week, I've watched 10 pounds melt off. It's so weird. The Wii Fit told me I now weigh 231.9.
Since I have several hours available daily where I can exercise, I can possibly lose weight somewhat fast. I will keep my calories around 1750 for now, since I'll be working out so much. I consult with a friend who is a nurse to make sure I'm not going to do something crazy.
I have just about 100 pounds left to lose. It's getting there!