Back on July 18, Dr. Kutryb gave an answer that is somewhat relevant:
http://www.medhelp.org/posts/Eye-Care/light-flashes-after-cataract-surgery-yesterday/show/1292408
For several months after my own IOLs were implanted, I noted that vibration or shimmer you are describing, particularly under fluorescent lights for some reason. My doc said it was an internal reflection off the lens edge and that it would diminish with time. In my case, he was right. The problem went away after a couple of months (though every now and then, I still get a hint of it under fluorescents).
But the fact that your vision has become less sharp means something else must be afoot.