Could be a lot of different things from something as simple as an inner ear infection, to sinus infection, to signs of a developing inflamitory condition, to a cardiac problem, to a small stroke, to a brain tumor. There's no way to know unless you have her evaluated by a doc, which I would do. What your describing is NOT normal. Go see your general practioner.
Is there any possibility of pregnancy? These sound like symptoms of morning sickness. I suggest a pregnancy test.