Emotions/Feelings are fundamental to existence itself i.e. they are the drivers for everything else. There is a lot of fascinating research/understanding going on in this domain which is worth studying. You might find the following two books interesting;
1) The Emotional Brain: The Mysterious Underpinnings of Emotional Life by Joseph Ledoux.
2) How Emotions Are Made: The Secret Life of the Brain by Lisa Feldman Barrett.
1) The Emotional Brain: The Mysterious Underpinnings of Emotional Life by Joseph Ledoux.
2) How Emotions Are Made: The Secret Life of the Brain by Lisa Feldman Barrett.