3D视图网格不同于渲染

I'm hoping someone has come across this before. I was working on my project and things were fine, then all of a sudden they weren't. In the 3D view my mesh seems all screwed up and my camera movement is very jerky. When I switch to camera view or do a render everything looks fine though. I'd appreciate any suggestions. Below is the broken 3D view, then a render from roughly the same point of view with the same layers visible.I'm hoping someone has come across this before.