I apologize for the late return. For some reason I didn´t see the notification of your message... I was initially diagnosed by an Infectious disease doctor. I know others with symptoms of fibromyalgia have had successful diagnostics done by rheumatologists. Dr. Kendal Stewart in Austin TX, who was very helpful, calls himself a Neurotologist / Neuroimmune / Genomic Specialist! When first pursuing specialist I did extensive internet research. There are a couple noteworthy centers dedicated to the research and treatment of ME/CFS. Dr. Nancy Klimas who is very sympathetic to our plight has an institution in Florida. Dr. Lucinda Bateman runs a center in Utah. I recommend taking advantage of the Health Rising website to further your search.