Nervous breakdowns and sad news

Ever feel like you are about to have a nervous breakdown over something that you are about to do, or have your heart sink when you heard sad news. Sometimes you ask yourself why. Why do you feel nervous when you know it's just gotta happen. And why is it though you hear this news what hurts you the most is that you can't do anything about it. These questions will always be there and you just have to except it sometimes.