About menses and breast size problem.

Hello doctor,i have menses problem last 4 month ago when my periods started then they can't stop after 10days also.then doctor gave me 21days tablets after that it stops.after that following month periods didn't come.after that, next month i got my periods again back. Followed by that i haven't any periods yet after 2months also.i checked for thyroid but result is normal. My weight is gain in this period todays weight is 70kg. Also i have breast size problem. Right is bigger and saggy than other. After exercise i feel that that smaller one become tight and smaller again but that big and saggy one remains same. I have no any pain and no any swelling there in breast. Everything is normal. But how to treat that saggy and big breast to make it same as other.? Please consult.