Allergies vs. Cold

I went on my run wednesday, a "Pain is Your Friend" run.   (I thought it was my buddy, hmmm, I guess it's a different kind of friendship)  It was an interval workout, 30 seconds hard, 1:30 walk, 1 minute hard, 1:30 walk, 1:30 hard, 1:30 walk... you get the idea.  Well, I ran it at night, and for some stupid reason felt the need to be all anal retentive about logging splits... what a dumb ass I am sometimes.  Anyway, it got to be too much, and really what's the point? Later that night I had some sinus problems.  Big shocker, I know.  It felt like I was catching a cold.  Due to that, I 86'd my 7 miler scheduled the next day.  I had class and was looking ahead to a 10K on saturday, which brings me to...