I don't know what's going on, but...

I'm starting to get concerned. At the base of my right leg, where it connects to my foot, I experienced mild discomfort late in my walk at Relay For Life on early Sunday morning. I attributed it to fatigue and just normal wear/tear for 15+ miles. It was sore on Monday, but only when I laced up my shoes. It was sore yesterday, but for the same reason. This morning, I was up before 7/am to do my run. I started it but didn't come close to finishing it. I really hope this is just a case of my shoes being tied too tightly and not something severe. I might have to take today off and strength train, instead. F!