Chest/ neck pain/ shoulder pain. Left?

I recently have done my stress echo, came out negative. Ten year back in 2011 - did angio (not sure y) came out normal. In 2015- did nuclear test, tmt and others- all normal. Have pain in the neck that reaches upto ear, jaw (dull pain) and shoulder region. Upper back and neck is always stiff. My physio says my posture is very bad ( scolasis) and hence this pain. I dont have any problem while walking and climb up to 12 floors without any struggle. Its just the neck and back pain since its on the left side. Sometimes, i do get a sharp pain in the left side chest that goes away in second. My chest is tender to touch and some points are really tender. My q is - can i safely rule out its related to non cardiac reasons. Also, is there any other test that is left???