So, I write this hoping this could help some of you to be familiar with Japanese doctors easier. First of all, CFS is NOT well-known disease in Japan. So, make a list of all of your symptoms and your concern that you want to ask to your doctors, every time before you go to see your doctors. If you can know that you will be late, then call up to the hospital on the way to the hospital from public telephone, explaining your reasons. General practitioners don't have such rule.
Some exceptions exist.
But, anyway, be careful for your first visit. All out-patients will be required to fill out a form that will be handed at reception, at their first visit. This is common phenomenon in Japan. Native Japanese don't surprise to take 2 hours a way in order to visit big hospitals. So, don't expect to get friendly attitude from doctors.