Memorial Day slog-of-a-run

7 miles this am, and home before 7am. Talk about gritting my teeth and slogging through. My whole stomach was tied up in cramps and my back was very sore at the same time. I am unaccustomed to having pain on both sides like that, and it resulted in a less-graceful-than-usual gait, which I watched my shadow struggle through with interest. Also, my long-beloved ipod sensor has gone awry and is measuring me at least a minute slower/mile than it should – which means I was running as fast as possible only to show a slow pace. Based on my limited understanding of how the sensor works, too (all I have is this wee squirrel brain, after all) the pace imputes the distance, so it also underreports how far I have run.
So, in short, it was a slow, short, very uncomfortable run this am.
Not feeling very confident about my ability to do 13.1 in six short days. Gulp.