Did emotions cause emotional disorder, or did something else cause emotions to go haywire?
From a French publication (Les troubles bipolaires:de la cyclothymie au syndrome maniaco-dépressif), It is known that great figures like Napoleon Bonaparte have bipolar disorder.
气. According to 黄帝内经, the five organs (心肝肺脾肾) creates Qi. Note that the organs in TCM does not correspond one to one to the organs in Western Medicine.
喜怒哀乐. [TK:what] disturbs Qi.
志: [TK:what] creates Thought.
思: Too much Thought [TK:does what].
[TK: explain how Too much ambition damages Qi]
that's just one possible source of emotional disorder. There are way more sources where an emotional disorder can arise from.