Yikes! I've only been running a little over a year, so I don't want to even try to suggest what may be causing your pain.
However, like Carolyn said, I'd rest for a few days and rest smartly. Ice, Ice Ice! Also, are you able to stretch your hip muscles without pain? I find that if I don't stretch my hips often enough, my hips get a tight feeling that is uncomfortable when running. It's a discomfort, but not a sharp pain. I've always read that you can work through muscle tightness but pain means you should stop.
Also, I ran in a half a week ago and a little over half-way I got a mild pain in my right hip, which I've never had before. I, of course, finished the race and then I noticed when I was stretching it was still a little tender. I took a few days off after the race (which I would've done anyway)and iced it once a day and then when I went for my first run I was fine.
Next race: Akron half marathon 9/25/10
Cleveland half: 2:47:58
Athens half-marathon 2:44:44
If you view your run as an opportunity, your attitude will get an adjustment.
Perpiscuity and beauty of composition are not to be sneezed at in this rotten world.
| Pounds lost: 4.0