Any job can be hard and can have many different issues.  One issue could be frustration with not getting what you want and when things are out of your control.  That is normal to feel that way, but it takes time and a different perspective to regain focus on a job. 

     Another issue could be that you are overwhelmed from work and the tasks that need to get done.  To overcome this, it is important to accomplish one task at a time.  That will help you to not get overwhelmed too much.  If you focus on too many activities, then you will feel overwhelmed and frustrated.  It will cause you to lose focus of what is important.  What is important is to work the speed and way you are comfortable with.  Everyone accomplishes tasks differently, and that what makes us unique! 

     A third issue could be exhaustion, and this is a common issue.  What causes this issue is not getting enough sleep, or sleeping too much.  It is important to get the moderate amount of sleep.  The average sleep a person should get is 8 hours.  Although, there are some people that can sleep less than that.  As long as you don't feel exhausted every day after you get up, then you will be fine.  Sleeping is important so every day, you wake up refreshed and have more energy.

     I hope this helps and if you have anymore suggestion of topics that you want to discuss or me to discuss, let me know.  You have a good day.  Take care of yourself.