Breast Implant Discomfort After 10 Weeks (Silicone 325cc Under Muscle)

I had breast implant surgery on November 11 2009. I had silicone 325cc under the muscle placement. Since then my right implant has healed very nicely and I barely even know it's there, but my left implant feels very uncomfortable and aches alot, I can constantly feel it whenever I move. It feels like I have something heavy on my left side.

I feel very comfortable with my implant on the right breast. Is it possible if it comes to it, that the left breast alone can be fixed?

Could the left implant possibly have fallen out of its pocket, and would an examination reveal whether or not it is improperly placed or would I need to get it X-rayed? Is it possible if it comes to it, that the left breast alone can be fixed? Thank you so much for answering my question.