Appreciate that some stress can be useful - without it we would be bored and less effective. A recent survey found that nine out of 10 Londoners experience stress at work but that 50% are still happy with their jobs.
Identify what is making you distressed so that you can turn distress (negative stress) into eustress or positive stress - which you need for high performance. The more specific you are, the more likely you will be able to use the stress positively.
Decide what is beyond your control and put it firmly to one side. Focus on what is within your sphere of influence and get on with it.