There are serious potential causes behind Trump's behaviour - here's just one. 

Trump has taken Propecia (finasteride) - to help prevent male pattern baldness - for many years, according to a report released by his doctor. The side effects of this drug are legion, and serious. The term post-finasteride syndrome (PFS) has been coined and hundreds of lawsuits have been brought in regard to its sexual side effects, (shrinking penis, poor sexual function) and the drug's effects on cognition, mood and mental states have been documented in the scientific literature. Many users noted a "disconnection between the mental and physical aspects of sexual function," and changes in mental abilities, sleeping patterns, and/or depressive symptoms. Sound familiar?

Trump must be particularly insecure to take this drug. Not a good quality in a world leader with the means to kill billions at his fingertips. For those interested see ... http://onlinelibrary.wiley.com/doi/10.1111/jsm.12269/abstract