Shin pain again!?! go back to the doctor?

Sounds painful, my husband had something kind of like this when he ran for awhile, it could be a stress fracture like the doctor said, my husbands went away but he also doesn't train for anything like it sounds like you are. I would go back to the doctor or get a second opinion, at least let him know that your symptoms have not gone away like he said. You may just need a little more time to heal, or it could be something else. The shin is pretty hard to do extreme damage to so it may just need time, start out slow and work your shin back up but defiantly see the doctor.