Depending on what needs to be done, breast revision surgery is generally less painful, with a shorter recovery time, than your original breast augmenation surgery.
To revise your particular situation, I would consider removing your breast implants, and using the scar tissue that has formed around your breast implants to change the size of your breast implant pocket. The scar tissue around your breast implants is called the "breast capsule". The edges of this capsule can be used to make your breast implant pocket smaller on your side, and smaller at the bottom. When your breast implants are put back in, then your breast implant position will be more towards the middle, and higher, than what you currently have.
If this maneuver is insufficient, then a new pocket has to be created. This completely new pocket will be made to place your implants more towards the middle, and slightly higher.
The revision surgery with just capsule manipulation should not hurt that much, and recovery should be only a couple of days with pain medication. With creation of a new capsule, your breast revision surgery may be more painful, but still should be less than your original procedure. Usage of a pain pump will help with pain recovery after surgery.
Thanks for the great question, and best of luck with your recovery!