Muscle spasms

I've had Fibromyalgia for years, but have mostly had it under control with food and exercise. Sometimes with some pain medication. Never anything I considered more than a minor annoyance. (Yes, I've been very fortunate.)

Anyway, almost 2 weeks ago I had to sleep on a folding cot under stressful conditions. I do this once a year for 3-4 days (visiting ancient father). Usually my back recovers in 3-5 days and I have no longer term issues.

This time it's kicked off a huge bout of fibromyalgia symptoms - everything seems to hurt. That part is manageable. What's bothering me is this...

My erector spinae muscles just won't stop spasming!!! Everything helps for 3-4 hours, then bam! By everything, I mean massage, ice, heat, hot shower, massage, chiropractor, physical therapy, stretching, pain medication, moving, not moving... I'm not sure what else to try. I have no idea if this is related to fibromyalgia or not? Suggestions welcomed.

PS. I did just locate a 2 year old bottle of Flexeril, which I will try in the morning. Does it help fibro? I seem to recall that I still have them because they didn't help this issue previously, but at this point I'm willing to try anyway.

Ancient = 98 yrs old, still has all his wits, lives alone, blah, blah, blah. As opinionated and ornery as ever.

Not Ankylosing Spondylitis or anything of that type, definitely erector spinae muscles in spasm.

Still wondering if muscle spasms are commonly associated with fibromyalgia?