Rae said it better than I did, except it was my PM clinic (at the time) who offered it, and it was for chronic pain. I forgot about the guided imagery part, but yes - this guy's office was overbearing with all the little battery-operated fountains, landscape posters, new-age music, and incense (or scented candles or pot pourri - something stinky, anyway...)

My problem was the same though - I could never concentrate through the pain I was trying to alleviate. The guy who taught it kept telling me how great it worked on patients with cold hands (I forget the term he used; might have been Raynaud's phenomenon or might have been something else) but every time I asked how it worked for chronic pain (especially headaches), he dodged the question.

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I've learned a lot of ways to distract myself from pain, but never headaches. To me, they're the most difficult because they're in our heads (where we live, if that makes sense).
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Even though I couldn't get it to work, I still believe in the theory; I have been able to use it to drop my BP by 10 points or more withing a few minutes (not that BP's ever been an issue). That tells me that is does work for some things for some folks, so go for it, and Best Wishes!

Doc