hi. noted history of mastectomy on the left, breast pain on the right breast area and current gallbladder pathology. the pain you re experiencing may be radiating or a reffered pain from your gallbladder pathology. but it is still best to consult a doctor, preferably a general surgeon, for physical examination and clinical evaluation. certain breast pathologies such as fibrocystic changes of the breast, fibromas and other breast lesions must also be ruled-out. diagnostics such as breast ultrasound and mammography may also be of help. management (medical and/or surgical if indications are found) will be directed accordingly. hope this helps. good day!! ~dr.kaye