Hm, it does
sound like possibly sciatica / herniated disc, but the CT scan should've detected it. That's what detected mine years ago. I don't know about the nerve conduction test that others have suggested, but sounds like a good idea. To at least help the pain til you get a diagnosis, can you get a little relief from Motrin or Paracetamol or muscle relaxants? Hot packs or cold packs?
It's possible that these are a part of your fibromyalgia symptoms. Sorry, I don't know your history -- have you been diagnosed with FM? Are you still in search of a diagnosis for your pain?
When I have FM flares, I've got pain and stiffness in my neck, shoulders, between my shoulder blades, my lower back, butt, left thigh, calves, feet, hands, forearms and down the sides of my body. And yes, in the morning, you could refer to it as though having been hit by a Mack truck ... I like to refer to it as feeling like something someone scraped off the bottom of their shoe.