I sometimes get back pain that severe (though luckily not very often anymore after physical therapy to get some of my muscle tone back). I really hope you can find some answers and help for it, back pain is some of the most debilitating pain there is.

Doesn't sound like FM to me. 😔 Sounds more like Bursitis. Good luck.

Me also I suffer from unexplained spasms in my lower back

Then maybe it's muscular. Fibro..I guess an osteopath would know.lots 9f us start with ongoing unexplained pain Mine was in my lower neck at first and after walking in pain the muscles in my back and legs would spasm and I'd have to stop.really bad pain .but. no Injuries muscular

I had test done xray cat scan ekg no answers