I have had trouble with swelling feet for about
a year now. It seems to happen when I spend a lot of time outside in the warm weather. My suggestions: stay inside with air conditioning and try to elevate your feet for a few hours, that may reduce the swelling. Only thing is that for me it usually takes a couple of days of being inside to make a big difference.
Be joyful in hope, patient in affliction, faithful in prayer (Romans 12:12).