How To Treat Beriberi/Edema (Manas)?

On my 37 weeks of pregnancy, I have experienced swelling of feet and legs commonly known as MANAS. According to others, it should have been gone once Im done with my pregnancy. It is already 1 week after I gave birth (ceasarian) but the Manas is not gone. I have been elevating my feet and legs while lying down and apply hot compress once/twice a day. What else can I do? Your comments and suggestions are highly appreciated. Thank you.