Some random left shoulder pain & occasional tingling in left side of jaw & some nausea. exercise did not worsen symptoms. heart related or anxiety?

Many causes: At 28, it is more likely to be musculoskeletal pain or anxiety. Still, because heart conditions are so serious, you do need to have it checked out.

Something else: Your symptoms don't sound like either cardiac (nor anxiety-related) symptoms especially given your age and you did not mention if you had any cardiac symptoms, your symptoms do appear to be referred from another source, perhaps stomach or esophagus. I suggest seeing your primary care physician who can evaluate your symptoms in more detail and examine you.