Emotions are subtle bastards. There are actually two types of emotions that are paired together, those that you experience consciously and those you kind of feel, unconscious ones. The latter act as what I suppose could be described as colored lenses, and are caused by neurotransmitter levels and limbic system activity, while the latter are more related to possibly prefrontal cortex, generally the evolutionarily younger parts that correspond to higher-level, conscious activity.
Depression, for instance, impairs your ability to perceive things positively, leading to negative, conscious thoughts, which, on closer examination are quite irrational if you notice how biased towards negativity they are. But guess what, a depressive person who would notice that would get even more depressed once he realized it instead of doing anything to fix the problem, because he filters out most non-negative interpretations.
Interestingly, it appears that depressed or healthily sad people tend to have a better memory scores than the same people when they're happy.
Sadness and anger also tend to be somehow entangled with each other, with sadness replacing anger while the object of anger cannot be subjected to agression and anger replacing sadness when someone is blamed for causing it. It might be that sadness is anger redirected onto oneself.
I suppose conscious control over emotions is hardly anomalous, given how willing your body into doing things seems perfectly in character for human physiology (placebos, nocebos, I choose you!). On the other hand, it might be less control and more conscious repression, and repression can surface at the perfectly wrong moment to bite you in the ass.