This mess is something new for Trump. Before becoming president he could afford the luxury if firing at will. (Granted, he has been able to fire the legal lady who defied him, but that's an exception). He's out of his milieu. It must be frustrating for him. His health will surely suffer . He's just not used to diplomacy and working in concert with people in a normal diplomatic give-and-take environment. In other words, as has been said  before, he isn't qualified for the job.