Re: What is "pain" and what is "injury"?
From Jeff Galloway's Book on Running:
"It is an injury if it's:
Functional: If it keeps you from running in a natural way
Continual: If it goes on for more than a week
Increasing: If it gets worse
Swollen: Compare the two knees, ankles, etc., to see if one is swollen.
Painful: Pain is the body's way of telling you to pay attention. Dr. Richard Schuster, a New York podiatrist, tells you it's OK to "run with annoyance, not pain." Don't us an artificial expdient such as medicine to override your body's signals and keep running."
It seems to me it is getting slightly worse, has gone on for more than a week, and is painful, so it's probably an injury, though maybe quite minor. Unless you rest completely, it will not get any better. I'd try heat on it as well. You have really been working hard, so your body is telling you it's time for some time off.
I agree with Julie- do something different. You won't go back to that couch potato. Yoga, swimming, walking, and other activities that don't stress it are great to do right now! I'd just rest for a week, then go back to doing light exercise and things that don't hurt it.
Kelli