Volition is the act/will of choosing; it is the exercise the mind has to consider an idea. Angst is a type of undefinable inner anxiety ( an inner feeling):
"Most people are as happy as they choose to be"~Abraham Lincoln
You can choose to overcome and choose to be happy. Many people choose unhappiness and depression for a variety of reasons of which they may or may not be aware of. If they seek happiness and does not attain it, then they are looking in the wrong places; for example:
Some examples include:
The human mind/emotions are a very complex dynamic system...to be continued ("Happiness is a Choice"-A manual on the symptoms, causes, and cures for Depression, Frank B. Minirth, M.D. & Paul D. Meier, M.D (1978)).