Hmmm... Well, the first problem isn't a glitch :3 At some point you probably hit the Ctrl key on the right side of your keyboard, and that's what changes it. For example, you can use it so you can move your character whilst looking behind you at the same time.
If the head is stuck in the same spot and doesn't move with the camera, hit Alt to "unstuck" it.
And could you also describe in more detail what you mean by "glitching"? Maybe screenshot it?