Hi Rosie
I have RA and Fibromyalgia too. They do commonly come hand in hand. With the Fibro I find the fatigue is the worst. Apparently Fibro stops you sleeping deeply (won't go into the technical) so I take Amiltryptilene to help with the sleep and fatigue. Also take 'One-Alpha' which is vitamin D - made a great difference and feel less sleepy.
Another Fibro problem you may read about is Fibro-fog - affects memory. Makes me drop things too as my hands kind of forget they are holding something. It isn't too bad at the moment.
I found this site quite helpful
http://www.ukfibromyalgia.com/ along with NHS Choices.
I would definitely recommend you look into Amiltryptiline and One-Alpha to help with Fibromyalgia.
Angie x
Be yourself - everyone else is taken. XX