Posted: 21/12/2016 at 17:09
As a young whippersnapper you should have good bone density (if you've got a normal healthy background) and that amount of treadmill running sounds very low to be the cause of a stress fracture. You've not suffered any acute injury to the foot (dropped a weight on it) have you?
Going to A+E for an X-ray is likely to be inconclusive as stress fractures only tend to show up when they've started healing. MRI is reckoned (around these parts) to be the best way to spot, but if you've got to go to your GP for a referral you could be waiting some time.
If it's not getting better on its own you should probably seek out some real life person rather than a random bunch of electrons on a webpage. Some people are lucky to have GPs with a sporting background, who know what they're on about, the rest of us have to try to filter through the throng of other people who should know to try and find someone trustworthy.