Hi. I don't know how long you have had fibro but my suggestion would be to get as much information about
fibromyalgia and have everyone read it. Print it out and lay it on the table. Make sure all the info is from respectable resources. Hope that helps, it's what I had to do.
Also, when anyone says anything to you about being fine one minute and using cane the next, just say, "well, it is a very unpredictable disorder".
One of the best things I did to feel better was to avoid people who said things like that. I know with family it can be hard but these were coworkers of mine I had to see every day. Finally, when I would come in and they asked how I was feeling, I just said, "Fine thank you, how are you?" And walked away.
As for those who have new aches and pains all of a sudden, really, isn't it just sad that their life is so unsatisfying that they have to make up stuff and compete for attention? Let them think they have it. While your pain continues, after a while they will get bored. Those who may have it, you did what you could, the ball is in their court.
I don't have to justify my pain and other sensations in my body to anyone and neither do you. Some people just don't get it and never will. Don't give them anything and they can't take anything away from you. Don't ever feel like you have to defend yourself.