His overall behaviors suggest serious mental disturbances. They create the facets of reality he doesn't like as a consequence of them. Take the case of a person who suffers from extreme paranoia who harms another because he believes that person was out to get him. The police then go after him and he says "they are out to get me" and so attacks another and so on until he's caught. In reality "They" are out to get him, that is the police. Like the police, Google is out to "get" Trump in the strictest sense of a paranoid as it lists his actions and responses to it. "IT" is after him.
'Extreme paranoia' suggests to me a situation that's almost completely (or completely) in the sufferer's head. What's happening with Trump in the press is very real.
IMO this is a person who lacks insight to such a degree that he seems toddler-like in his inability to understand cause and consequence as well as understanding that he's not the centre of the universe, that he needs to factor in how other people are likely to react to his actions. I'm not a mental healthcare professional, so I have no idea when 'insufficient insight' would or could be classed as a mental disorder, rather than just retardation caused by whatever.
IMO he's been stuck in his own little golden bubble, ie. shielded from consequences to an obscene degree all his life, therefore he lacked sufficient insight into how things work in reality or the fact that if he succeeded in his ambition to become President then all the shit he could get away with as a reality TV star and playing at running his own businesses would not fly as his actions would be put under a microscope of a power that he couldn't even begin to fathom let alone handle like a typical adult* due to his lack of life experience.
* - let alone the extremely experienced person one needs to be to handle such a high-profile job.
Furthermore, IMO most ordinary adults would crack under the strain of ascending to the Presidency in one step, and would likely flip out on the record. The only benefit that Trump had over a typical adult is that he's used to a camera being pointed at him, but he's woefully under-equipped in every other respect for the job. If I had to bet, Trump honestly thought that the Presidency involved photo ops, hand-shaking and speeches and that was it. Apart from him sticking to the script, that job description sounds like something he's vaguely suitable for (along with pretty much every actor who ever lived).