It is best to first learn the deep breathing and visualization techniques when you are calm and in a good mood, so that when you are in pain, discomfort or anxiety, the effects will transfer to you positively. That may not be possible, but keep that thought in mind.
Exercise is also a very important component of stress management as well, and to the general maintainence of cardiac, circulatory , and brain health. It will release the tension and anxiety in your system. Slowly increase the number of days and the length of time that you exercise. A daily walk of 20 to 30 minutes is all you need. Exercise helps your body to release it's natural endorphins (body's opiates)
Deep breathing: One of the easiest and most effective techniques is simple slow and deep breathing. Begin by breathing slowly, rhythmically to the count of "1, 2, 3, 4" and out "1, 2, 3, 4". When the rhythm is comfortable and relaxing, focus on feeling even more relaxed with each exhalation and feeling warm, light, weightless, and tingly (In a good energized way) as you exhale, envision all your tensions and anxieties flowing outward with each breath. This can be repeated any time you need it through out the day. You may also feel comfortable increasing the breathe count. This keeps your anxiety and tension level down by actually decreasing the Co2 in your blood.
Guided imagery is another method that you can perform separately or in combination with the deep breathing. Use your imagination to create a pleasant place or event. Perhaps start off like you are going on a journey in a forest, to a mountain, on a ship, etc. Using all your senses, smell pleasant smells, feel warmth, taste something pleasant, hear pleasant sounds, and imagine pleasant surroundings. You can also visualize a positive outcome to your situation or anything else you may be worrying about (such as relief of pain). It is said that if you can't imagine it first, you won't recognize good things when they start to happen, and you could miss it. So imagine how it would be to be completely pain free or happy and calm and looking towards the future with excitment.
Here is a web site that has a short video that you can also try to get an idea on how to get yourself started with breathing and visualization.
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Good luck tomorrow!