Swollen ankles

I'm a teacher and we started going back to get hints set up for the school year a couple days ago. School starts on Tuesday and I actually more nervous for this year then ever because I'll only be there about a month before I go on leave. Anyways, just going back to work these past couple days I've noticed my ankles swelling. Since the kids haven't started yet, we have been in lots of meetings. I do feel like I have been walking more through out the day but that's really it. My feet have been fine but my ankles have been pretty swollen by the time I get home. I've been wearing Nike roshe (a populate running shoe) so I don't really know what else I can do to keep the swelling down. Any suggestions?