Hoping it's not injured!

So, after an *effortless* 4-miles on Friday morning, I couldn't even do 1/2 mile tonight with out stopping! My achilles tendon was killing me, and my foot was starting to fall asleep! I'm hoping the tendon issue was just dehydration (the only thing I had to drink today was a diet coke, unlike my usual 80+ ounces water), and that the falling asleep issue was just my shoe laced to tightly! I'll try again tomorrow night and see how it goes.