[Sarrr]

I'm an Xray tech, so I'll tell you what I can.

Statistically, you are about 5 times more likely to sprain/strain your ankle rather than break it. However, all those injuries look exactly the same on the outside. I've xrayed ankles which I thought nothing was wrong, which were broken. I've xrayed ankles which were so bruised I just knew they were broken, but nothing showed on the xray film.

If you stand on it and put all your weight on it and move, does it make a crunchy sound/feeling? If it crunches, it's more than likely broken, however, only a doctor can truly tell you, and most of them will want an xray to be sure.

Properly treated, you'll recover from a broken bone faster and easier than you will a sprain/strain. Either way, go to a doctor ASAP, because if it's swollen that bad then you really shouldn't be playing on it: it could cause permanent damage, even losing the use of that foot, if you reinjure it.