There are unfortunately still a lot of medical practitioners out there who either don't believe in it or know nothing about it. I don't like disclosing my diagnosis with new doctors because you just don't know how they will respond.
Another interesting tidbit, by the way, is that studies have found that people who are more active and athletic are more likely to develop ME. That was the case for me. It's really rough going from being an active, semi-athletic person to being barely able to function.