Dear user. Cherophobia is the fear of gaiety, happiness, joyfulness or rejoicing. The origin of the word chero is Greek (meaning to rejoice; gaiety or happiness) and phobia is Greek (meaning fear). Could be affected due to history of extreme traumatic events - sudden death of family/friend, sudden loss of financial support, sexual abuse - rape. Medicines can't cure phobias completely instead they temporary suppress the systems. However treatments are available for phobias, such as counseling, hypnotherapy, psychotherapy, and Neuro-Linguistic programming. Take care.