Left side chest sharp pain n shoulder I have been experiencing sharp chest pain or pinching at left side of chest bone.and sometimes chest tightness  and sometimes skip beat or fast instant beat of 2-3 sec I don't what is that. Shoulder pain or pinching and hand also Something I feel like sometimes rotating and coming up over chest I have went to more than 3-4 cardiologist done 6-7 ecgs, 2 2d echo, tmt test, lipid profile test, sonography of liver and also mri of brain and neck all are normal just one time ECG was flacuated and vitamin b12 is less but other than this all reports are normal it's been happening since last 4 months all cardiologist said all okay but issue is still there