In normal energy production for every calorie you burn you make 33 molecules of ATP (cellular energy). In fibromyalgia you are often making 3 ATP instead of 33 (1/10th the energy) and a pile of lactic acid. You need to employ strategies so that you are making 33 ATP per calorie more hours in the day at which point your energy will feel better and your head will feel like it is working. The more you learn about this subject the better, as it also involves how you eat and how your thyroid is functioning. The following links help provide you the additional information you need to know. It is a good idea to read my book, the Leptin Diet, which is like having an owners manual on how hormones work in your body and how to eat so that you actually get more energy from the food you are consuming.*