Right leg hurting...

So the mid part of my lower right leg is hurting for more than a week now. I thought it would go away... but it's not going away. :s When I went to the gym, the next day it started hurting. So I took 2 days break and ran after. Then it started hurting... it only hurts when I walk or when it's windy/cold then it goes away after a few minutes of running. I don't know what's wrong... and it's only my right.