For the past two months I have been having breast pain?

I’m 27yo no PMH. For the past two months I have been having breast pain. My gynecologist sent me for a BL US of the breast and it came back negative. Not long after I started having tenderness and tingling around my left clavicle and neck. I do not feel any swollen lymph nodes. And I am still having breast pain. What do you think it could possibly be and when I go see my PCP should I ask for an MRI or CT scan? Thanks.