The only realistic way to stop an abuser is to confront abusive behavior when it begins. Once a pattern of abuse has been established an abuser comes to expect that the abuse will continue to be an outlet for their problems and attempts to oppose them will cause them to escalate.
No matter what you have to leave immediatelty. As a victim of abuse your presence in the cycle of abuse is the only factor you control. When you are not present you are not facilitating their abuse and not causing it to intensify.
You can certainly look into getting them medical assistance but abuse is not cured like a phobia or delusion. People can be medicated for conditions that agrivate their abusive behavior or they can learn tactics to deal with their abusive nature but abusers are not cured, they are managed.