FMer here as well. Malic acid is also a good mineral to have. It commonly is in apples and is its own supplement.
I am also going through a bad patch because of changing meds recently so it has kicked my FM into high gear. The best advice I can give you is to take your vitamins, rest and drink plently of water.
A good info website is
www.immunesupport.com . Its the easiest one I can think of right now.