Well, as it turns out, the fanbase's worst fears have been confirmed. The team took to Twitter today and confirmed that Doughty has suffered a fractured ankle. In fact, the fracture is so bad that he needs to get surgery on it. From there, he is going to be out month-to-month.
This means that you probably will not see Doughty on the ice before Christmas or the new year. However, you never really know with modern medicine. Doctors have gotten a lot better at treating these injuries and doing so extremely fast. That said, Doughty is getting up there in age which certainly adds to the recovery process.