Hello,
Regarding the breast soreness and enlargement causes are fibrocystic breast disease,ductal ectasia,mastitis(inflammation of breasts),galactoceles,benign and malignant pathologies of breasts,referred pain from
liver or musculoskeletal system,arthritis of the ribs,costsochondritis and inflammation or sprain of pectoralis muscle.
I feel that an examination by a gynecologist will be the best.