What causes short pinching pains in chest above left breast below collarbone? Pcp says heart ok. CARDIAC ANXIETY! Shoulder and neck tension!

Likely correct. Depending on what, if any, testing your PCP did to come to his/her conclusion, the general characteristics you describe are not primarily cardiovascular. Musculoskeletal or less likely, gastrointestinal, causes may be the culprit. Not likely warranting a stress test, but for your anxiety, may be considered (though your insurance company may disagree...keep that in mind)