Dull pain on and of about two inches below my collar bone. on my left breast, it comes and goes some days.

Chest Wall Pain: This sounds like costochondritis, which means that you have some inflammation and pain of the fibrous joints of the anterior ribs just a short distance from the breast bone. It is usually very tender to press on the spot that is causing the pain. Avoid over stressing with exercise, lifting etc. Heat/cold packs alternating may help. Advil, or aleve (naproxen) type meds help to reduce the inflammation etc.