I am one of those. I am just about to start the last bit of my recovery process... which I know will be successfull although not easy.
The problem was/is disseminated parasitic infection most likely due to Entamoeba histolytica. Unfortunately I have a feeling that many many people who are not well have the exact same problem. E. histolytica is one of the hardest parasites to find in lab tests, and one of the easiest to get.
If you suffer from: migraines, sinus problems, adrenal exhaustion, thyroid problems, muscle weakness, digestive problems, heartburn, hemorroids, skin problems, itching, gums problems, teeth problems, general weakness, bad moods, feeling down, and your symptoms tend to come and go, E.histolytica is your likely culprit.
Let me know if you want me to share I am getting rid of it.