Building Trust = Key
As a psychologist, i'd want 2be part of a treatment team 4this individual.
Psychologists aren't medical docs & as such don't prescribe meds. I'd be curious about how meds known 2sharpen thinking would affect this person's perceptions & ideas. A psychiatrist could recommend meds 2 try. Hopefully, we'd work together 2help this person find ways 2sense when s/he could use others' reality checks.