When to nurse it and when to push it?

Wow, how life can just take over and leave no room for anything enjoyable...like writing.
Over a month with no post, despite having much to say.. I suppose that is how it always goes. If you've actually got something to say, it's probably because you're out experiencing life and not sitting in front of your computer, waiting for an idea to strike.
On July 14th, 2012 I participated in my first race.
Ok, so that isn't entirely true. I volunteered for a race, and was the last leg of the run to ensure no runner was left behind.
Did I mention yet that this race involved numerous stops where a beer is had before going on to the next?
So it isn't the most prestigious race in the running world, but it sure was fun!
It was the 4th annual Craft Dash in North Portland. My boyfriend was also volunteering and that is how I got to know about it. It was 6K, although with all the stopping it wasn't exactly a full on race.
I did, however, manage to injure my knee AGAIN!
Today was actually my first run since that day.
The day after the Craft Dash my boyfriend and I had to pack up a 16' Penske truck with all his belongings and drive 12 hours down to the bay area.

 The days following were packing and unpacking, lots of heavy lifting and stairs too.
Needless to say, my injured knee went from bad to worse. 
I've started up with my knee exercises again, which I never should have stopped but it's so easy to forget to do them when my knee isn't in agony.
I also took it easy for awhile and just started going for walks in the last week to see how it's doing.
I went running today, despite knowing it wasn't my brightest of ideas but being driven by feeling lethargic and well, chubby.
I barely got half way into my run and knew it was a horrible choice, and then made an even worse choice: to continue.
That's the thing about an injury. How do you know when to nurse it, and when to push it?
Today, I definitely should have nursed it but of course I pushed it.
I'm not a very patient person, and injuries require a LOT of patience. Hopefully I haven't set myself back too far and can go again before too long. Perhaps for now, despite my resentment toward it..I'll nurse my knee a bit more and stick to walking.