It might take a long time to get an appointment, but Dr. Systrom in at Brigham and Women's Hospital in Boston may be an option. He's a pulmonologist, so he's not an expert in all aspects of ME/CFS. However, if you suspect dysautonomia he is experienced with that. He's very good at assessing someone based on their exercise testing (during the initial appointment you do some very informal exercise testing such as stepping up onto a stool and back down again for a minute or so while wearing monitoring equipment), and he looks for objective measures of something being off.
The Dysautonomia International website also has a list of physicians that might be helpful:
http://www.dysautonomiainternational.org/page.php?ID=14
I was recently referred to a doctor on that list, Dr. Roy Freedman (at Beth Israel Hospital in Boston); I've been told that you have to fax over your doctor's notes to his lab, then it takes 4-6 weeks for the him to read the notes and decide whether or not to see you.