Hi, Missy
When I have the flu, I am in the bathroom w/ a bucket. W/ the Fibro, I get the achy, tired, miserable feeling. That is usually how my body feels w/ a flare. Sorry, I can't give you a better idea.
Do hope this is short lived and you are feeling better very soon. Take a warm bath when you get home from work, some gentle stretches and relax.
God bless. Alice.