Yes! This is EXACTLY what happened to me last June. Got a stress fracture in my 2nd metatarsal just as I was about to start running. I did not have to wear a boot---the podiatrist--and the recent literature---say that a carbon fiber insole (which specialty shoe stores may carry) will keep your own shoe stiff enough to let the stress fracture heal. You might want to get a second opinion, therefore, about whether you MUST have a boot or if there is some less obtrusive way to keep your foot stiff for the healing period. My carbon fiber insole worked just fine for this. Cycling shoes are also very stiff, so I was told I could keep cycling. I also kept swimming--I was very careful walking to and from the water to keep my foot from flexing. When the tri came 6-7 weeks later, I walked the run.
Started a Learn to Run class in October. Have been going 9-12 miles a week since then without any injury.
You can get through this!
"My predominant feeling is one of gratitude. I have loved and been loved;I have been given much and I have given something in return...Above all, I have been a sentient being, a thinking animal, on this beautiful planet, and that in itself has been an enormous privilege and an adventure." O. Sacks