Hello~Unfortunately, when a person is diagnosed with fibro, folks just believe it is all in their head, it is sad, I go through it all the time, I finally just don't tell others how I feel or just say I hurt all over. If they don't believe me, I just think the heck with them, they are not worth my time anyway, true friends will believe you. It seems like if you have any other illness like a sore throat, heart issues, etc, people take you serious, but things that really don't have a clear-cut diagnosis or cover a wide range of symptoms, people think you are lying.
I am sorry your doctor put you on a control list, that is not right, wasn't he the one that told you that you had fibro in the first place?
I wish I had an answer as to how to convince people, but sadly, if they are not going to believe you, nothing you can say will change their minds, maybe one day if they are diagnosed with it, they will understand.