Runs lately...

My runs lately have been crap. Its almost like I hit a wall. For about a week now, I couldn't make it past the mile and a half mark mentally... at least I believe it was mental because I wasn't absolutely exhausted.
I have been getting this lovely stabbing cramp right below my rib cage about a mile and a half in... any ideas?
On the bright side, I had a pretty awesome run this evening... I turned off the music and just ran. Tried to keep an even pace, tried not to worry too much on my landing, and tried to stay loose. Went a straight 1.86 miles. It felt good... but that damn stabbing cramp made me stop and hobble home.