In WA can a person file a lawsuit against own mother for personality disorder

Yes, you've "nailed it", most juridisdictions would regard such claims as frivolous and disallow any recovery based upon such facts as described.

Yes, you've "nailed it", most jurisdictions would regard such claims as frivolous and disallow any recovery based upon such facts as described.

There is a huge debate about whether emotional distress must be manifested in physical symptoms in order to translate into money damages. You can't sue somebody for having a mental disorder. You can sue somebody for intentional infliction of emotional distress. As a practical matter, I doubt whether a jury would look favorably on your situation. I wouldn't go so far as to use the extremely insulting term "frivolous", but it wold probably be unprofitable.