I can empathize with your frustration--and have had those days myself. Too many to count. I have a hard time losing weight when I'm in training for a race and actually tend to gain weight.
Have you tracked your intake? I know you're expending a lot of energy, but to fuel for those double-digit runs you might be taking in more than you realize? I use SparkPeople right now, as post-Disney marathon I still wasn't losing weight. I was stunned at how many calories I was taking in for recovery, and needed to shift my eating. Heck, just seeing the carbs/protein/fat breakdown of my diet helped me make different choices. (Sparkpeople's calorie counters will show you these things.)
Also, as athletes we have different needs than more sedentary folks.
Runner's World offers a section on their website for Nutrition and Weight Loss. Have you checked that out? Here's an article on the
10 Rules of Weight Loss for runners. In terms of XT and running, you know you're doing good things for yourself. Your body might have become really efficient, though, and so you might want to challenge yourself with intervals, higher intensity, higher weights, a different order.
Most important, know you're not alone. It's a real struggle to figure out the balance between being fueled to complete the runs--and OMG the Goofy training--and losing weight. Right there with you.
