Swelling in feet and calves..

I work on my feet all day and by the end of the day my feet/ankles and calves are swollen and uncomfortable. Anyone else having this problem?? I put them up at night and take magnesium, but it's like I don't get enough time to recover before the next day when I'll be on them all day again. Any tips?? Oh and I do drink a lot of water so I am staying hydrated. Thank you.