3 things you can do.1) Keep legs elevated.2) Do heel/toe raises...basically pumping your toes up and down. Muscle contractions in the lower leg assist with circulation ad even blood clots.3) Wear a compression sock or stocking. Ask your doctor about these...you can get them at most major drugstores but certain medical conditions may contraindicate their use such as diabetes.good luck.
Diabetes can do that by causing kidney problems, check your blood sugar.