Swelling and dull achy pain in my left breast a year after surgery. What could have happened?

I would suggest going back to your surgeon and being checked. You might need some antibiotics if your Galaflex has become contaminated with bacteria. You might need blood tests and even an ultrasound.

Dear S_mamaof3,
I understand your concern. However, without a proper assessment, it would be difficult to determine what went wrong. It is best that you visit your plastic surgeon for further assessment or ask for a second opinion. Only after a thorough examination, you can get proper recommendations and advice.
Daniel Barrett, MD
Certified, American Board of Plastic Surgery
Member, American Society of Plastic Surgery
Member, American Society of Aesthetic Plastic Surgery