Is there a term for this?

I'm not sure if it's a complex, but I kind of feel like there's a technical name for this, but I can't think what it is, all I can come up with are vaguely associated conditions.
-subject appears frequently disorientated
-subject has trouble concentrating on a conversation
-subject shows a degree of obsession
-subject misidentifies other people as me
-subject often claims to be responding to messages from me
-subject repeatedly identifies self as a god
-subject often employs secretive language
These are deeply worrying behaviours. Even on the internet, those throw up a few red flags. Should I direct the person towards a professional? Or would engaging simply be exacerbating the problem?
What would you do?
-subject appears frequently disorientated
-subject has trouble concentrating on a conversation
-subject shows a degree of obsession
-subject misidentifies other people as me
-subject often claims to be responding to messages from me
-subject repeatedly identifies self as a god
-subject often employs secretive language
These are deeply worrying behaviours. Even on the internet, those throw up a few red flags. Should I direct the person towards a professional? Or would engaging simply be exacerbating the problem?
What would you do?