What exactly did your ortho and/or PT tell you? did you have an X-ray/Wikipedia reference-linkMRI or any other imaging studies?

does your pectoralis hurt towards the inner edge or outer towards your arm?

What about tenderness over your sternum or sternoclavicular joint (google it to see where it is)?

Is there any pain when you look all the way up/down/to the left or right or lean your head to the left or right?