The idea of losing control is scary. Completely out of control, hysterical expression of intense emotions should be avoided, unless you are supervised by a professional. Occasionally, a disturbing thought or feeling may occur to you. Some people object to expressing emotions by using cuss words and obscenities. You should use whatever words are naturally expressive for you.
Many therapists also doubt the efficacy of catharsis and abreactions.
Private expressions of feelings, as in this self-help method where the intent is clearly to reduce the unwanted emotions, could result in decreasing both internal emotional stress and overt expression. You may want to try it and see how you respond but use caution. Much more research is needed. Remember, anger, fears, and sadness probably grow, if one obsesses about the situation. In fact, just talking about a highly emotional problem and expressing your feelings with a friend is not always helpful.