I have been suffering from chronic back pain for years. I have tried all kinds of conventional and alternative therapies. Someone suggested me that EFT(Emotional Freedom Therapy)might work. Has anybody tried this therapy?

Emotional Freedom Therapy - EFT courses in Brighton and West London (http://www.therapies.com/eft/eft.htm)

What is EFT?

Emotional Freedom Techniques stands for Independence. By independence I mean freedom from negative emotions. That is, freedom that allows you to blossom and rise above whatever hidden hurdles keep you from performing to your capacity.
Freedom from years of self doubt... or call reluctance... or grief over the loss of a loved one... or anger... or negative memories involving rape or other forms of abuse.
Freedom to earn that greater income, make those business calls, start that new business, improve your golf score, lose that weight, approach people with ease or become a public speaker, singer or comedian.
Freedom from the anxiety that causes you to take those pills, drink that alcohol, smoke those cigarettes or raid that refrigerator.
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EFT - Emotional Freedom Therapy or Emotional Freedom Technique (http://www.healing-house.co.uk/freedom.html)

EFT - Emotional Freedom Therapy or Emotional Freedom Technique - is a 'meridian' therapy, which stimulates the acupuncture meridians on your body to release negative emotions that are stored in the body and are connected to memories and patterns. We 'feel' emotions in the body – muscles will tighten when we are stressed, for example.

We know that there is a powerful and scientifically proven link between the mind and the body. If you think of something frightening, your body will react by firing off the fight or flight response. Conversely, if you exercise your body, your brain will produce neurotransmitters like Serotonin.

We know that placebo drugs are effective and that some physical conditions are psychosomatic. Psychotherapy, Hypnotherapy and NLP work with the mind to change the emotional responses and behaviours we experience in the body. Meridian therapies work with the body to free undesired patterns in the mind, and associated emotional responses.

It is a useful and effective complement to the thinking-oriented disciplines of other therapies.
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Hope the above definitions help you know what EFT means...
I haven't personally tried it, hopefully someone on the forum has tried and could give a more opinion on this.