Re: Lower leg pain, please help...
Since it only hurts when you stand, this makes me think it's a minor tear or muscle pull. When you're standing, the muscles in your calf and foot are more elongated than normal and would aggrevate a tear. It doesn't sound like a stress fracture.
My suggestion is to ice it using an ice cup (freeze water in a plastic cup and then massage the area) 2-3 times per day, elevate it when you're watching TV at night, and once the pain subsides you can start strengthening exercises so you'll never have the problem again. My main suggestions would be barefoot strides a few times per week, avoiding shoes with a high heel, and using a foam roller on your calf/soleus.