I know how disappointed you must feel. I had several experiences like that myself. Was he a regular neuro or a neuromuscular specialist? Is there a large University hospital that does a lot of research in the Netherlands, if so I would try there. You should be able to search the doctors biography online and see if he has published papers or done research in MG. When you find one with experience like that ask to see him. I had to do a lot of searching on the internet before I found a neuromuscular specialist well experienced in MG. Don't give up.

Good luck
kathie