I don't know how much you already know, so responding could easily miss the mark. Sorry. The most authoritative text I own in my own library is called Chinese Medical Qigong Therapy a Comprehensive Clinical Text by Jerry Alan Johnson, Ph.D., D.T.C.M., D.M.Q.(China) It is too involved for me most of the time. Personally, I studied my medical Qigong with Yang, Jwing-Ming, who has published innumerable and readable texts on the subject. I am fortunate to live near his world wide headquarters in Boston Massachusetts, however, he does travel all around the world and has schools all over. Some medical applications are included in my school and you can learn more about that at Kyusho.com and log onto the forum there. We do get involved in headache cures because one of the side effects of pressure point practice is that people get headaches and the appropriate application of revival techniques helps to reduce these. Other pressure point systems probably have comparable sites. I also live near enough to the New England School of Acupunture in Massachusetts and I take continuing education courses there. If you are near an acupuncture school, they probably also have continuing ed classes. Now- do I believe in it? Sometimes. I'm a nurse trained in the traditional western way. For myself, I have had acupuncture treatments and I find that I get equal benefits from qigong practice. I hope you find at least some of these leads helpful.