Emotions do not exist
As the rebbe taught, many complex, unanswerable questions are simply poorly posed questions.
Any emotion is a poorly formulated reaction. Sequentially:
Joy. Fact: some resource has been received, in the broad sense. Physiological reaction: jumping, smiling, anticipating, and demonstrating its receipt to others. Question: What is joy? Unraveling the question: in reality, it's doubt about the quality of the resource, that's all.
Sadness. Fact: some damage has been sustained that cannot be compensated for through aggression. Physiological reaction: decreased activity, withdrawal, conserving remaining resources, and demonstrating the loss. Question: What is sadness? Unraveling the question is an attempt to understand how the damage can actually be compensated.
Anger. Fact: some damage has been sustained that can be compensated for by initiating violence. Physiological reaction: readiness for action, motivation, a veil before the eyes, a "fog of war" for an individual, if we're talking about affect. Question: What is anger? Unraveling this question involves trying to understand whether it's worth initiating violence or how to convince someone to endure it because they're a loser, and your job is to force losers to suffer.
And so on. Physiologically, all responses to stimuli are perfectly rational. The problem is the ever-present third party, which inhibits natural reactions and actions. Say a dictator dies, and you're happy, but you have to feign sadness to avoid being shot. Or maybe you're attacked, and you should run and complain, not take over or destroy all the aggressor's resources because they violated neutrality.
Emotions are a term for gaslighting. As if your reactions are wrong, inappropriate, unjustified. Generally, this can happen. But this happens completely independently of emotions: incompetence produces the same effect. The fact is that the closer to the body, the more extreme, sophisticated reaction optimization is rigged into our bodies. Therefore, the elements of thinking that are close to the body are attacked first.