Also known as 'tapping,' this technique has been attacked as working only as a placebo. However, users report relief from symptoms and these alleviations appear to be lasting. It is free. Training is available through the Tapping website, linked here. Most of us tap regularly. It works.
Science & Theory behind the Tapping World Summit - Bruce Lipton
A field approach to science does not negate the importance of discovering the
various mechanism of function that are found in biology. However, a mechanical
approach alone limits the scope of discovery while a field approach expands it.