Can breast implant revision surgery be done in one breast only?

Yes, it is certainly possible to limit your surgery to one breast and probably even the recommended approach to your condition. Discuss the options and timing of your revision with your surgeon. 

Yes, a revision can be done only on one breast.  
The implant selection should be based on a combination of your desired size, soft tissue dynamics, breast base diameter and skin elasticity.  I recommend an in-office examination as well as a detailed discussion with a surgeon who you are comfortable with.   Finally, make sure your surgeon is a Board Certified Plastic Surgeon certified by the American Board of Plastic Surgery (ABPS).Best,Dr. DesaiBeverly Hills Institute for Aesthetic Plastic SurgeryHarvard Educated, Beverly Hills & Miami Beach TrainedDouble Board-Certified, Double Fellowship-Trained Beverly Hills Plastic Surgeon

yu can certainly have just one breast  revised in your situation.  I try not to use different size implants unless absolutely necessary.  I have heard stories like yours before. 

Dear Peaceful1490,
breast revision surgery can be done on one foot and it is the most difficult plastic surgery procedure performed. Botched breast surgery alters normal tissue planes and laxity, the ability of breasts to heal properly, and leaves scar tissue that dramatically affects the level of difficulty of the corrective surgery.Many patients come in to correct poor outcomes from their initial surgeries. The most common problems are due to implant malposition, bottoming out of the implant, poor scarring, and incorrect implant size.While the type of revision required will depend on the result of the previous surgery and the desired result of the patient, some revisions involve extensive pocket repair that may or may not need specialized external bras.If you are considering breast surgery revision, you should speak with a board certified plastic surgeon and have yourself properly assessed. Only after a thorough examination you will get more information and recommendations. Also, you have to make sure that your surgeon understands your breast augmentation goals.
Daniel Barrett, MD
Certified, American Board of Plastic Surgery
Member, American Society of Plastic Surgery
Member, American Society of Aesthetic Plastic Surgery

Yes, in general patients can have a revision in just one breast. Continue following up with your surgeon for their advice and for the best timing of the surgery.  

Yes, that is definitely possible, but that will cost money to buy a new implant. Why not just have the surgeon reverse the implants? If the mistake is as you say, that should be done at the surgeon's expense.