@savannahjan I'm so sorry you are experiencing this! I'm over 3 months out and still have great sensitivity on my scar. Is that what you are experiencing or is it the entire surface of your knee? I know that many nerves are cut during surgery and they take a long time to regenerate. In the meantime you will probably experience a lot of strange sensations: I've felt itching, burning, and just an awful prickly feeling a lot of the time. The only thing that has helped to desensitize the area is rubbing it with a dry washcloth: this was my PT's suggestion. You might be too early in recovery to do this. I also still use Aspercreme topically, it's lidocaine.
I *hate* it when surgeons shirk their post-op responsibilities. Don't back down if something is wrong!
Post again when you've had more feedback.