I am curious about this topic, which was mentioned during a recent doctor’s appointment. I have been sick for 15 months with vague but debilitating symptoms. The short version is I had sinus surgery 02/2016, developed Shingles & mono 4 months later that was the result of an undetected sinus infection. Treatment with antibiotics and steriods for a month cleared the infection, but I have been left with other problems. I have heart palpitations, GI problems, fainting, dizziness, extreme fatigue, weakness, body temperature problems and with tingling sensations in my legs and lung pain. I have been scanned, stress tested, tilt table test, endoscopy, colonoscopy, EMG, ECG, heart ultrsound, blood work and now have a loop recorder for the heart. I get a swelling sensation in my chest on the left side that causes dizziness, belching, pain and fatigue. I do have a hiatel hernia and gastritis. I am gluten free, dairy free, red meat free and have been to 15 doctors. I went to running 3 miles a day, lifting 50 pound bags of grain and hay, working full time and taking care of my family. I presently can do small amounts of housework. The last doctor mentioned Autonomic Dysfunction and told me to research…google is vague and cannot find a doctor to who treats this disorder. Any suggestions wil be helpful…running out of options.