I was recently diagnosed with autism level 1 (Aspergers) and was searching on this topic because I think I may have an autoimmune condition. This was posted in 2012 and the topic is still relevant. In the last weeks or so I have been exhibiting some symptoms, extreme fatigue, heaviness in the frontal neck area, flue like symptoms and brain fog. They occur to me in flares if I continue to put stress onto my body it can led up to neck and back stiffness. I have suffered with these symptoms for years. I think I may have Hashimoto thyroiditis. Which is an autoimmune condition. I also have a gluten intolerance , I am allergic to soy and suffer from stomach inflammation.I believe that there's a link between celiac disease and Hashimoto thyroiditis. The information I've read above has been helpful. My self -diagnose thyroiditis are just lose connections and observations and I could be so wrong. I am in no way a doctor but after so many years of searching, several appointments and labs, I am just trying to figure out what's going on with my body.