Are you carrying too much weight? If you are, it may be possible to reduce the swelling if you can take off a few pounds. And do you have a job where you're standing on your feet all day, which could be another cause.
Sensible footware may help - no high heeled shoes. Have you tried looking a Birkenstocks sandals? They do a nice low across-the-foot strap flip flop with built-in arch and under the toe support which may take some of your foot strain away. Soaking your feet in cold water occasionally may also help, as well as lying on the floot with your feet raised and resting on the edge of the sofa or a bed. And in the colder weather, try wearing support-tights.
But if this is really troublesome, consult your doctor. You may be suffering from water retention which could possibly be eased by the appropriate medication. .