I'm A Dental Hygienist And Suffer From Upper Back Muscular

I'm a dental hygienist and suffer from upper back muscular pain. My general doctor has tried steroids, muscle relaxers and pain medicine without resolve. I have been to physical therapy, had deep tissue massages ( 8 sessions by two different therapists), and chiropractor without relieve. My muscles burn and feel like they are always tense. I have purchased an ergonomic stool for work and incorporated loop magnification for better posture and nothing seems to work. This has become a chronic rather than acute problem.... 6 weeks no and I'm worsen out from the discomfort. What kind of doctor do I see and will trigger point injections work or acupuncture work?