What Causes Dizziness And Nausea?

I am not someone who has ailments typically... don t have much need for even over the counter common pain killers. Don t get headaches very often, 63 yrs. old, female. In good health. This past week I woke up with a strong lightheadedness.... like my head is dizzy but not related to movement in particular. Nausea... eating doesn t help. Drinking plenty of water to stay hydrated. No pressure related to eyes, ears, ... no sinus issues... just this ache that runs down the back of my neck. Finally took Advil ... made a positive difference but when it wears off.... it is back to dizzy, nausea and I am wondering what these symptoms could be tied to?