Swollen feet after flight?

Hi guys.

I just took a 13+ hour international flight and arrived over 24 hours ago. The night before the flight I wore these god-awful shoes that really hurt my feet, and then almost immediately turned around in the morning to hop on said international flight. Now, during my first full day here, my feet have become moderately swollen. Propping them up has decreased the swelling some- in my right foot it's gone down quite a bit but in my left one it's still a bit more swollen. I'm a little concerned but it's too late to go to a doctor here save for an emergency so I was wondering if there were any professionals on who could give me an opinion on what might be up. Thanks a ton!!