As we understand, we gain acceptance. With acceptance, we can begin to forgive. As we do this, the feeling of being angry ends. It takes time. Fear and love are often considered the two basic motivating emotional forces in life.
Fear frequently motivates in a negative way and can be counter productive.
Look into the fear to learn from it. Educate yourself, and try to refocus your energy on desire. Sorrow and sadness frequently stem from loss and feeling a lack of love. As we identify our losses or why we don't feel loved, we acknowledge ourselves and our sadness. Gradually we free ourselves from the sorrow and move to a state of acceptance and peace.