The technique I now use is my own fork of a technique that comes out of the chiropractic professional called Neuro Emotional Technique.
I'm a little reticent to talk much about it here, because hey everyone knows chiropractors are all charlatans right? :) Actually I kinda do too, but this technique is pretty powerful, and several very skeptical, conventionally-minded people I know have tried it out and found it very beneficial.
Things like meditation, mindfulness and hypnosis can be very effective for some people, but where they don't yield results, NET can offer answers.
If you want to know more about the science of how this stuff works, I recommend a book called The Biology of Belief by Bruce Lipton, a former Stanford researcher in cell biology who observed the way cell health responds to environmental (including emotional) stimuli.
The basis of the approach is that most of our core behavioral traits are somehow "hard-coded" into our minds at an early age - as the saying goes, "give me the child up to the age of 7, and I'll give you the man". Some of these traits may be linked to early life traumas or unhealthy value systems picked up from parents or other influential people, and some of them may lead to self-sabotaging behaviour in later life. To fundamentally change behaviour after this age is difficult, unless you can use one of these techniques to deprogram the undesirable beliefs and replace them with healthier ones.
I've also seen my rate of improvement increase since I started doing a form of yoga called kundalini. It seems to be very effective at strengthening the core and lower back, which makes a big difference to overall health.
NET is a separate modality of its own - http://netmindbody.com. It uses muscle-testing to find the belief or trauma causing the undesirable behavior or response, then a short meditation to release it.
I understand it's similar to Psych-K, but I've not tried that - though I am interested.
I have done tapping and initially found it beneficial but soon hit diminishing returns. I've since read a few things that express the view that tapping can be harmful.
When I started out with NET I'd visit a chiropractor, but recently I've learned how to do it myself, which saves me a lot of time and money and allows me to progress much faster.
Appreciate the reply very very much. I've found psych-k and tapping both revolutionary for handling rapid onset emotional issues. I'm going to learn NET too, now.