You often feel like you are having the flu, but it's even worse. My friend wrote a blog about it describing it pretty well. I'll share it with you here: http://fibrowarriorslivinglife.com/2016/09/18/w...
There are ways that I help my clients try to keep their flares down to a minimum. Reach out to me if you want some suggestions.

Feels like a bad flu...,achey, skin hurts to touch, foggy, etc

No matter how much sleep I get I'm exhausted (falling asleep at my desk or fighting it while driving) it seems like every single step I take hurts and drains my body. My pain level increases even with taking pain meds, headaches are more tension type. My energy level is below zero. I also get big knots in my neck and shoulder blade area

For me, it's an increase in symptoms (a big increase) & just generally crankier. My son used to say, are you in more pain? I'd say yes, why? Am I crankier? He'd say oh yeah. Hope this helps.
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I know as soon as my eye sight starts going blurry that I'm in a flare also pain increases too .