Ask yourself this question, "Why do we fall?" My answer to that is so that we can learn how to pick ourselves up.
Things happen in your life you may not be able to control. Knowing how to take each thing and make something positive out of it, is how you can overcome any adversity.
If you are not happy with your job, or what you are doing in your life, why do you do it?
Loving what you do in life, and the pursuit of your dreams, is what makes life worth living.