Workplace issues are often the things that get to us the most.
If you are really finding that things are getting too much for you though, please talk to a professional! Your employer may have an Employee Assistance Programme (EAP). This is a free programme that normally offers a small number of free counselling sessions that can help put things in perspective. If you are a member of NZNO, the Membership Support Centre will be able to point you in the right direction as well - phone 0800 283848.
Additionally, you might also like to have a quick look at the following video: