As others have said get your BP checked. If all is OK with that then my only advice is to get your feet up above your head. That's what my OB told me to do when it happened to me. I hsd it for several months and it got worse towards the end so much so that I could barely walk with open toed shoes on (in the middle of winter). Lie on your couch with your head low & your feet up on pillows or the arm rests. He also said to massage your ankles & calves downwards (whilst they are pointing upwards) to encourage the fluid to return into the rest of your legs. I feel for you, I remember how uncomfortable that was.