Chronic mid back pain. Tingling, numbing feeling. I have had this for about a year. Not kidneys not disks. Drs are stumped. Help!?

MIdback pain. Where do you feel the numbness? Where is the mid to you?At the lower end of the rib cage or between the shoulder blades?I I use the terms "thoracic, " spine with ribs "lumbar" ribs to pelvis "thoracolumbar" where the two join. Thanksfor the question.
Likely arthritis . Facet joint arthritis in thoracic vertebrae is likely cause if all imaging studies are seemingly normal.