I am sorry to hear about your concerns after breast surgery. Although it is difficult to give you precise/meaningful advice without viewing photographs, it is generally possible to improve breast symmetry, assuming significant breast asymmetry is present. Exactly what operation would be necessary will depend on your physical examination and goals. You may wish to post photographs with your next post (frontal and side views with your arms by your sides) for more specific advice. You may find the attached link, dedicated to revisionary breast surgery concerns helpful to you. Best wishes.