I have just had a short stinging dull stingin pain in the left side of my chest just to the left of the left pictorial?

Pain: most probably musculoskeletal and of no consequence it should completely disappear

Not uncommon : The mechanism must involve a small nerve, similar to an eyelid twitch. Perhaps there was a minor injury, strain or trauma (that you don't recall..also common:) I don't believe it is the sign of something more ominous down the road, such as MS. It can be classified as a minor annoyance, and you can be reassured.