Thank you for your question. Depending on how much drooping has occured, You may benefit from a breast lift on one or both sides to achieve better symmetry. At that time, switching your saline implants for silicone may also be beneficial. The treatment plan would depend specifically on your anatomic findings. Consider an in person consultation for more specifics. Best wishes.
Each breast will respond differently. It sounds like you need a lift on one side. Best of luck.......
It is hard to suggest without seeing you or at least seeing photos. But in general if one breast is in good position and the other has some sagging, then perhaps a small breast lift on the low side would even you up. See a plastic surgeon who does a lot of breast lifts and you like their before and after photos. Good luck.