Please save yourself a lot of wasted time and money and the real risk of having your medical records "polluted" by the Mayo clinic (my present endocrinologists words). Skip the Mayo for ME (CFS). I went to the Mayo in 2007 and was quickly dismissed as a psych patient. The endocrinologist even mislead me about a review of my past brain MRIs that showed a number of issues.
Compare the Mayo CFS website with Stanford site: http://chronicfatigue.stanford.edu/ There's a world of difference and at Stanford you'll actually receive effective treatment from someone who recognizes ME(CFS) as a serious immune issue with infectious CNS implications. The Mayo on the other hand has adopted the British/CDC model which is frightening in its willful ignorance of the real nature of this disease.