Running for a reason

It's my last day of vacation today and eager to get outside, I decided to go on an anger run.  My frustration levels lately are high with being stressed out over work, personal life, etc.  All week I have been couped up in the apartment and I just wanted to spend some time alone.  So I hit the road and my first mile I felt great.  The wind was gentle and cool, the sun was just a little warm.  As I got to my half way point I noticed that my shins were super sore, and just aching.  I took a short break, did a little stretching, and allowed my heart rate to lower as it was hitting the high 170's low 180's.  I kept having this burning sensation over my shins and I finally got about 80% of the way through and decided to walk the rest to avoid injury.  Here are my stats:

Mile 1: 8:54

Mile 2: 10:52

Mile 0.27 : 11:15

According to RunKeeper, this was my second fastest mile since 4.18.2010.  My cardio seems to be improving as I have been focusing on running or biking indoors.