Heart been investigated- normal. but chest pain, jaw pain, left shoulder, elbow, wrist, hand/fingers! left leg also throbs when sx are bad.what is it?

Neck?: Is it possible that the pain originates in your cervical spine? Any trauma, known spine issue? Alternatively, it may be related to peripheral nerves on the left side. You will need a full neurologic evaluation to further determine the etiology of your symptoms.

Vague: Difficult to narrow down any type of causation without a thorough history and exam. Get more than one opinion if need be.