I noticed my breast is bigger, painful and swelling on one side. What should I do? I tried expressing the milk but there seems to be no milk already but i still feel very painful. The bigger breast has more milk supply compared to the other one.

It's sound like engorgement,mentioned by yuna,mummy it's best to shower although confinement for hygiene purposes as you are breastfeeding baby ,shower with hot herbal 大风草 water which you can purchase at Chinese herb store,try to massage your breast everytime before expressing milk to prevent engorge and hinder milk