I'm sorry! I'm glad you're planning on see a MD if there isn't improvement in 48 hours. I recently broke a few bones in my foot, and I would not have been able to tell the difference between a sprain and a fracture myself. As long as you don't need surgery, the main thing is knowing if and how long to be non-weight bearing and what kind of recovery time you need to allow yourself. You might need some type of boot as well, which will make getting around easier, but let's hope you are right and there is nothing broken.
Good luck. You are doing the right things for now.
Grits
2010 Trek 5.2 Madone WSD, SI Diva Gel Flow
2002 Terry Classic, Terry Liberator