I wish I had time to research this for you and put up a list of MG symptoms versus fibro symptoms. A GOOD doctor will know the difference. They are not similar. Fibro is about primary pain. MG is about secondary pain from weak muscles cramping and spasming. They don't know the cause for fibro. They do with MG. They have not determined fibro to be an autoimmune disease!!! MG is one. Fibro does not cause ptosis and fatigable weakness. MG does. Need I continue?!
Fibromyalgia, anxiety, chronic fatigue syndrome and depression are often thrown out there at patients, mainly women, when doctors do not know what is wrong with their patient. I know these are real conditions but the way they do it is NOT very scientific. It's like they simply can't be bothered to figure it out or even spend a little time thinking about it or researching it.
If you haven't done this already, write down all of your symptoms and see which ones seem to be fibro and which ones seem to be MG. Maybe even give the list to your doctor, with Fibro symptoms on one side and MG symptoms on the other.
Is it a neuro who said this? And, no, I've never had a neuro tell me I have fibro. Incorrectly that I have chronic fatigue syndrome, yes. And I'm not chronically tired!!!!
And it is entirely possible to have BOTH fibro and MG. I'm sorry if I am upsetting you by my blunt answers.
I hope you get solid - and scientific - answers soon. In the meantime, take it easy. Do something fun.
Annie