If it's not a serious fracture (You will know, it will be very visible. If it's not visible, it's just a regular stress fracture.) , all you can do is rest on it. You will need to see some sort of podiatrist to get some sort of MRI, confirmation of severity, and confirmation of how to deal with it. I recently recovered from one on my fourth metatarsal. If it's just a minor fracture, you'll be stuck sitting for most of a 4-8 week period. Keep your foot elevated, ice it for pain occasionally, and you're gonna learn to love ibuprofen. That's all you can really do. You would definitely want a boot just for traversal purposes, because walking on it will worsen it and make healing take longer.