As a final resort
Ask the doctor about medication. Nobody likes to think about worst-case scenarios, but sometimes, in serious situations, prescription medications (ranging from antidepressants to antipsychotics) are used to curb physical aggression.
Consider -- or at least stay open-minded about -- a new living situation. Signs that home care may no longer be viable include violent episodes that become routine (weekly or more often), medication that doesn't help, and yourself or a family member being injured or at risk of injury.