aproudbyg – If you live in NY call OHEL ASAP. If not call them anyway – maybe they can get in touch with Askonim and/or Rabbis in your town. Washing your mouth out with soap is plain abuse.
You’re so used to it -you don’t realize it’s abuse. You need help and fast. Stop feeling guilty and/or protecting her/them – it’s your parents’ illness -it has nothing to do with you.