I've been having dull achey upper back pain in one spot (behind my left shoulder blade) off amd on for a few years. Sometimes I won't feel it for months but lately it's reared it's head again. I wonder if it is acid reflux or something wrong with my esophagus? I notice it happens most in the morning. Had anyone had symptoms like this? Trying to not have a panic attack before my doc appt Monday morning.