Don’t worry about 4 or 5 days of testing at Mayo; its a piece of cake. I would highly suggest you get copies (CD’s if possible) of all medical visits/test you had done in the last year and take with you to Mayo for the doctors to review. It can save a lot of time for the doctors. After 10 months of doctors in my town not knowing what my health problem was, I went to Mayo in Jacksonville, FL. After 4 days of extensive testing I was diagnosed with a rare disease. I am under treatment now at Mayo and never felt better in my life. Sure testing was long, but not unpleasant and you have nothing to fear. Good luck to you and I wish you well.