i too have fibro. I have a lot of pain at tips of toes. the covers especially hurt my toes, and the pain is at the very tips, around toe nail, and mostly on big toes. Never thought it was due to fibro....but who knows anymore.
I bought a gadget from the medical supply store, that fits at end of bed, the covers lay over this brace, and takes pressure off of my feet. It makes like a tent over my feet. this really helps...you might want to check into one of these. it was not expensive.