Talk to someone
Whilst many of us might pride ourselves in our ability to 'cope', it is advisable to speak to someone when you are experiencing stress. Oxford Brookes has an Employee Assistance Programme that provides access to trained counsellors as well as other resources. Your GP is also there to provide advice.
See the Help and Support webpage for more information on the support available.
You are also encouraged to speak to your line manager, especially if there are work related factors involved.