Have you ever witnesses a paranoid schizophrenic what was highly functional, able to hold down a job? I haven't.Here is a paper that makes a case for Hitler having Paranoid Schizophrenia.
It is unusual for someone to have schizophrenia and be as highly functioning as Hitler but it is not entirely without precedents.
I've employed many people with bi-polar, a few with anxiety, panic attacks, acute schizophrenic problems and they mainly would not see a doctor and if they did, they wouldn't take their medicine. Most would self medicate with alcohol and drugs. I noticed most were high in energy and intelligence. That's what got them hired in the first place.