All emotions have their reason for being, their usefulness, and their place. We need emotions—they are what give our lives color and spice, even the "negative" ones.
Repressing emotions is never a good answer. Even if they don't make sense, you need to give them the space to be expressed. If the moment you feel them is not a proper moment to express them, take time to recognize them in your daily self-awareness exercise and channel them through appropriate means.
Anger, fear, and sadness are, for me, the most acutely felt and energy draining, but they are easy to identify and have very specific outlets. For example, anger makes you want to scream and hit something. Sadness makes you cry, so cry, sob, and vent all of it out. Fear is a red flag for danger, and danger has to be tended to. It either paralyzes you or makes you want to run or fight.