In need of suggestions to relieve swelling in legs?

I am four weeks postpartum and have terrible swelling in my legs. I did not have this issue while pregnant because I was able to walk for 30mins everyday. Now with bub here, I'm too exausted and sore from sleeping in either my glider or one position. Also it seems to be worst after going out to the store, so I do not think walking is going to help at this point. Any good tips moms?