Metatarsal Stress Fracture?

I went out running this morning and felt a terrible pain in my left foot, by the joint where my big toe attaches to the rest of the foot! I thought about stop running and go back home. I continued running  on grass as much as possible and slowed down my pace. It was a lot better to run on grass than on the cemented trail. I think I should give my feet some rest from running (or switch shoes). Time to get that bicycle out!
Here are some interesting readings on metatarsal stress fracture:
runblogger