Overtraining

When do you know that you've been riding too much?
My legs are getting this constant pain, and I feel like I'm hitting the wall after about 10 minutes of climbing.
I thought it was a nutritional issue at first, but I haven't been able to fix it - in fact, it's getting worse. Oh yea, I pulled my hamstring. That sucks. I keep riding on it. That makes it not better. That sucks too.
Maybe I'll take the next few days off and dust drink, instead of the usual ride and drink.

Speaking of riding - Casey (ADD Outdoors) is getting married in July and I think that we are going to get some saddle time in. Ahhhh - Indiana mountain biking....