Sera- not sure if you need more advice on the subject...and I don't know about the stone you mentioned- but I would like to share with you my personal experience with accupuncture, and reccomend that you find the BEST one that you can get to, even if it means driving an hour. I received accupucture from a man who was a MD in china and in the US, on top of all of his accupuncture credentials. he was amazing. my headaches when away completely for about 6 months, and I did not have a migraine for almost a year after i saw him( 2 sessions I think?) so I highly reccomend the accupuncture...but, don't go to just anyone. ask around and find out who has the best reputation. If someone is not as experienced, you may not have any relief...or if they place the pins in the wrong places, it could cause you a great deal of pain....
good luck, and let us know how it goes!!