My feet are swollen like balloons?

Lately, my feet and bottom part of my legs have been swelling quite a bit, especially my right one. The skin is very slightly tingly on my right foot but not numb. If I rub or scratch my right foot, it burns slightly Elevating my feet doesn't seem to help. I tend to get like this after sitting for a while, doing my schoolwork but doesn't go away very quickly when I get up and walk around. What is wrong with me and should I see a doctor?