frustration

I went to gym intending to do my 7 mile run but due to some *ahem* digestive problems from eating at Panda Express, I decided to stop at 3.3 miles. It is safe to say I will not be eating there again anytime soon. Also, my foot hurts again but in a different sport. This time it feels like it is inside my foot and I am worried that it is a stress fracture. I have had it on and off and didn't think too much of it. I never realized how much of training for a marathon was making sure I don't fall apart. I am icing my foot right now but I'm not sure if I should run today. I feel like I'm wimping out but stress fractures is not something to mess around with. Arg. I don't even know if it's a stress fracture but I have gotten many of them in the past and I can't afford to get one now. I have a 15 mile run on Saturday that I can't afford to miss.