Yo0u tell them "I have Fibro- Fibro can best be explained this way... Picture a battery- when the battery gets drained, you recharge it- people sleep at night and recharge to 100% by morning. People with Fibro only get to recharge to about 1/2 or even 1/4 by morning because of a defect- and by noone they are so drained they need to recharge again to make it through the rest of the day', and we never get to over 1/2 charge- so everything is much more effort for us because our bodies are running low on energy all the time... Oh, and our muscles and joints hurt all the time- we don't get breaks from that like a normal person does- Our muscles can't keep up with our normal every day lifestyles- and it's tough!"
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.