My dear Chinese friend made me a rich, dark brown beefy broth after I had DS2. It eliminated night sweats and gave me so much energy, I loved that soup! My DH drank some and loved it, too. I don't know what kind of herbs were in it, but I think it's one of the recipes posted by skreader. My Taiwanese MIL scoffed at my friend and made fun of her behind her back for bringing me the soup. My MIL still resents her MIL for making her drink the soup after she had babies.
My Chinese friend also recommended a soup made with dates and brown sugar, but I couldn't stand the thought of a sweet soup (I had an aversion to all sweets during my pregnancy and post-partum), so I never made it.