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.

Apply warm pack to reduce the swelling and comb breast downwards to "loosen" the milk supply. Can also try letichin tablet (buy from Guardian) to thin the milk so can come out easier. It's soya based natural, so don't need to worry about chemical hurting your body.