I want to agree the man is emotionally unstable, but I'm not going to state it as fact.   Most of us are a bit wacko in some part of our life, we're human.    I do think the man has a huge problem feeling 'secure' for reason's I don't/can't know.  It could be a demanding parent, it could be intense emotional experience that led him to mistrust others......

The President had almost full control of his self-constructed career.     He's clearly discovered for himself that Power is an effective way to get what you want, and as CEO he had strong control of his work life.   Control is often the behavior resulting from a deep insecurity.  Control means you don't have to trust others.    

This doesn't mean he's psychotic, but he is ultra sensitive to criticism and at his core, Pres. Trump has a strong need to control.   It's a leadership style that is not that unusual in the business world, where competing and winning, is the measure of success.     It also can get CEO's fired.