The Nutritional Balancing approach to healing is based on mineral and metal levels at the cellular level. Certainly an imbalance can cause symptoms you mentioned. NB uses hair tests, because blood tests only indicate what is circulating, and the body doesn't circulate toxins, it tucks them away. Hair tests can tell you what's really going on. Supplements are based on the test results. Practitioners are either biochemists or trained by one. You can find more information on http://www.drlwilson.com or http://www.nutritionalbalancing.org or http://www.forperfectbalance.com