About 3 weeks ago my foot started hurting. I thought it could be a stress fracture or stress reaction, so a couple of days later I went to the doctor. I got an x-ray, but nothing showed up. They said it might be a small fracture, undetectable with an x-ray, so they put me in a boot and told me to come back a few weeks later. They said another x-ray a few weeks later might show signs of where the bone is healing if it was fractured. Yesterday I went to the doctor to get another x-ray...nothing there, so they said it must have just been a stress reaction and thought I was better. Well today my foot has been hurting as bad as ever. Should I get an MRI? The doctors never mentioned that option, but with a previous stress fracture the MRI showed the fracture while the x-ray did not. Or could this be some other sort of problem? My foot hurts when I flex it, especially on the top.