The US Army, actually got a psychiatrist from Standford I believe, to assess Hitlers mental health in 1942 or 1943, to better predict how he would act under certain circumstances. I can't remember the dudes name, but he diagnosed him from afar, by observing his speeches, his behavior and he actually got to interview Hitler's family doctor, who explained to him the relationship between Hitler and his mother, when Hitler was young.
I can't recall what his diagnosis was, but he nailed predicting what his behavior would be, when the pressure mounted and he said Hitler would commit suicide as well.