Well, without a detailed clinical evaluation it would be difficult to determine the cause of your symptoms. Likely causes include postural issues, spinal structural defects, neuro-muscular causes, injuries, inflammations, degenerations, nutrient/ micronutrient deficiencies, refereed pain from other regions etc. With normal imaging studies structural issues are practically ruled out and other possibilities may need to be considered. You could try a few weeks of physiotherapy to strengthen the back muscles before considering a review with your doctor.
Hope this is helpful.
Thanks for your comments. My regular doctor actually prescribed massage therapy. I've been twice. I am hoping this will help. I had a very deep back massage that seemed to help the main pain I was having just to the left of my spine, but caused other pain that was almost worse. I know that this is a process, so I am doing my back exercises and will continue this 8 weeks and pray that it works.