Believe it or not, you need to be tested for LYME DISEASE!! A painful neck and brain fog are symptoms of Lyme Disease! Your immune system may be compromised by the Lyme bacteria, which can live in your blood and cells for years. In my case, I was symptom-free until I got shingles twice in 2006 and 2007. The doctor said that my immune system was compromised, but he didn't test me for anything. For the next six years, I told my endocrinologist that I was so fatigued, so tired all the time, and he kept telling me that there was nothing wrong with me. This past summer, I developed unbearable neurological symptoms of burning in my hands at night. After three MRI's and a series of useless doctors, I diagnosed my Lyme symptoms by researching online. Finding a Lyme specialist saved my life! The pain in my hands is caused by Lyme Disease. A neurologist did nerve testing and determined that I have carpal tunnel syndrome, but it's caused by the Lyme. Insist that your blood should be sent to IGeneX Laboratory at 795 San Antonio Road, Palo Alto, CA 94303 for the Lyme Western Blot test. Many people get a false negative from other labs (as did I). By the way, no tick is required. Some scientists think that Lyme is also spread by mosquitoes. Get the Lyme bacteria treated with antibiotics, and your immune system will have a chance to handle the other viruses in your body.