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cath007 a stress fracture can occur without having a fall, etc..it doesn't take much to fracture one of those little bones in a foot or even near the ankle; I suspected that's what you had since you didn't mention a scar, cut, etc.
You may have to wear a brace/cast or something, depending on how and where your fracture may be.
It's a tough time of year to have something like that with the snow and ice out there, be extra careful.
Take care, these things do pass, and I hope your school can accommodate you, and that you can get to your classes.
Best of luck!