You might want to share this info with your doctor. Not everything is associated with fibro.
I've had extreme fatigue, weakness, etc. for seven months. I chalked it up to fibro and blood sugar that was out of whack. (I'm diabetic) Nope. It turns out I'm anemic from a bleeding ulcer and am now being treated for it. I hope to be feeling much better soon. Yes, I did share all of this with my doctor seven months ago but he wasn't listening to me. He'll be listening to me at my October appointment...you can bet your life on that one!
So, let your doctor run some blood work on you and see if there is an underlying condition causing this.
Sherrine