So I've come to the conclusion that it's not a sprained ankle. While the pain did go away for a day or so, I woke up this morning once again unable to walk. The pain wasn't in my ankle this time though, it was right in the center of my foot. It actually feels like something heavy fell on top of my foot and just crushed it. In fact, it's worse than it originally was. I have not the slightest clue what's wrong with it. I've never had any foot/ankle problems in the past, except for a fracture nearly 10 years ago (this pain is similar to that). Hmm... it is quite a mystery...