Hi @peiter
Had you tried with another known working lens?
how about looking at the viewfinder and LCD screen?
tested the image output on your PC?
If all had tried I think it need to be re-calibrated / repair at the service centre
https://photo.stackexchange.com/questions/64841/dropped-my-nikon-d5100-and-the-image-sensor-seems-to-be-out-of-place-what-do-i
If it is still under warranty... send in for service...