Has the pressure increased? Were you already working flat out and then more responsibility was added? Did you get a new boss or change jobs? Did the organisation change, responsibility change, your status change?
How balanced is your life? Is it all work and no play? do you work so hard that by the time you get home you have nothing left? Do you sleep properly or wake each day exhausted from a lack of sleep? Do you regularly spend time with friends, laughing joking or just unloading your frustrations?
Conflict is a fact of life. If you avoid conflict you may creating additional stresses. If your boss or organisation keeps making unrealistic demands of you can you tell them. Are you assertive - can you ensure that your needs are balanced against the needs of the organisation? Do you feel resentful? Does the organisation encourage employees to discuss stress factors with a view to managing what can be managed.
Physical exercise is a great way to increase balancing endorphins that stabilise mood, restore perspective, lower blood pressure and generally remove and neutralise the imbalance in your hormones caused by stress. People who exercise suffer less depression and anxiety and can have a more positive outlook than those who don't exercise. Does your employer encourage you to take part in physical exercise or give concessions on local gyms?