First, place yourself in a comfortable and relaxed position; preferably choose a dark room or, any place that offers a quiet environment. Close your eyes and focus on a point. Now begin to slow to slow down your breathing. Then breathe deeply with your chest and continue doing so for about 4-5 minutes.Once you feel yourself in a controlled state, you can use imagery techniques. 

Here's how:

The procedure to demonstrate that your mind is capable to alter perception and sensations in the body is called altered focus. In order to achieve this, you'd need to focus your attention on any specific non-painful part of the body - your hands, feet and simultaneously alter the sensation in that part. Just for example, imagining your hand getting warmed up should and will take your mind away from the chronic pain that's happening in other parts of your body.

Dissociation involves separating the painful part from the rest of the body mentally. 

Process is simple: one needs to imagine the body and mind as two separate entities and allowing the mind to distant itself from chronic pain. What you are able to do picture your painful back sitting on a chair and tell it to just stay there, away from the mind and never come back.

Mental anesthesia is a strategy of imagining an injection of numbing anesthetic right into the hurting area. In the same way, one can also visualize a relieving ice pack being paced onto the painful area.

Mental analgesia is envisioning an injection of a intense pain killer right into the painful area. However, you are free to imagine your body releasing large number of endorphins that functions to distress and take your thoughts to somewhere else, away from the ailment.

Visualize shifting mind produced altered sensation, heat, cold, anesthetic into the painful area.

Imagine taking a time travel and get back to the days when you were pain-free. Now, take into consideration same phase at the moment and instruct yourself that this imagination is true and you are free of chronic pain.

Consider a symbol that says a lot concerning your chronic pain, such as some irritating noise from a TV program. Reduce the irritating qualities of this symbol by reducing the volume of your TV set, thereby minimizing the intensity of pain steadily.

A lot can be obtained out of it if you focus your attention on enjoyable scenery, a beach, a city, where you have always wished to go and where you are carefree and relaxed.

One can try calm counting method such counting breaths, imaginary sheep, stars to deal with hurtful episodes.

You can also try shifting chronic pain from one area to another, where it is easier to cope with, and finally into thin air.
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