Shim, here is Meera DA beautician's (cough cough) advice. Must be the hot water u r using, use a mild or cold water if u can stand it. 2nd reason must be the shampo, try using a herbal shampoo. Might even be the food, cut on the fried foods and lean towards fiber-based food. Fourth and DA one I am suspecting is stress.Try de-stress technique like meditation, yoga or listening to soothing music. If nothing else helps, get a professional help!